9th Class Chemistry English Medium Chapter 1 Online Short Question Preparations

Preparations for exams is the most stressful part in a student's life and it became tougher when a student has not any particular know-how that how to do preparations for exams and how to get good results. Students who as a beginners in their board exams are mostly very anxious from their tip to toe because they can't feel satisfied with how much they prepared for their board exams, and that's a common problem among all the students of BISE, this issue now finally has been resolved by the hardships of this website ilmkidunya because this website portal give all the BISE students in Pakistan an online preparation method from where a student is easily re-test himself/herself before starting of taking their boards exams.

Chemistry, when a student firstly listens to this subject name they definitely come in stress because the chemistry subject is as difficult as its name indicates it. When a student starts its preparation for exams he/she feel uneasy to learn some subjects chemistry is also one of them because of containing many numerical, balance chemical equations, chemical reactions, and its end products and many other things. To get a full grip and strong command on this entire subject a student is need to understand this subject high logics which is mostly based on its chemical equations, chemical reactions and also the numerical side which if a student is well practiced in solving these things he/she must get the highest grade in his/her board exams because these mathematical base questions give you full marks present in any subject.

Understanding the need for the student the ilmkidunya.com organize the online preparations setup for all the ninth class students according to the syllabus issued from the board of examination. This website provides a platform where the students can easily prepare themselves for all subjects of the ninth class before their exams by explaining each subject in a simple and easy way. This site dividing the chapters in the form of units and each unit is given in the form of the short questions and their appropriate answers, and a timer is also given there because all these setups are produced for the students to prepare themselves according to the board exams pattern. By solving each unit of every subject, a student is easily capable to solve the whole question paper in exams because this website gives a highly emphasize on every topic and provided all the basic and essential requirements according to the demand and needs of the student and the educational board in Pakistan.

This online preparation method is fully free to practice test session for all the students of ninth class and any student can use it after login itself in it. It is too simple to do and too useful for exams preparations.

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9th Class Chemistry Chapter 1 Online Preparation
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Online Short Questions For Chapter 1 "9th Class Chemistry English Medium Chapter 1 Preparation "

Try The Short Questions For 9th Class Chemistry English Medium Chapter 1 Preparation

  • Total Questions10

  • Available Sets86

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Chemistry (New Book) - 9th Class Chemistry English Medium Chapter 1 Preparation

Question # 1

Write two difference between atom and anion

  • Ans 1: Ion :
    1: It is the simplest unit of ionic compound
    2: It has net charge either negative or positive on it
  • Ans 2:
    Atom
    1: It is the smallest particle of an element
    2: It has no net charge , It is electrically neutral
Submit

Prepare Complete Set Wise Questions For Chapter 1 "9th Class Chemistry English Medium Chapter 1 Preparation "

9th Class Chemistry English Medium Chapter 1 Preparation - Set 1

Question # 1

Write two difference between atom and anion

  • Ans 1: Ion :
    1: It is the simplest unit of ionic compound
    2: It has net charge either negative or positive on it
  • Ans 2:
    Atom
    1: It is the smallest particle of an element
    2: It has no net charge , It is electrically neutral
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 2

Question # 1

Define Mendeleev's periodic law .

  • Ans 1: Mendeleev arranged the known elements (63) in the order of increasing atomic masses in the horizontal rows called periods . So that elements with similar properties were in the same vertical columns . This arrangement of elements was called periodic table . According toMendeleev's periodic law properties of the element are periodic function of their atomic masses
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 3

Question # 1

What do you mean by delta sign and why it develop ?

  • Ans 1: The delta sign indicates partial positive or partial negative charge that is developed due to unequal sharing of shared pair or bonded pair of electrons
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 4

Question # 1

Compare two physical properties of metals and non-metals .

  • Ans 1: Metal :
    1:Almost all metals are solid (except mercury) they have high densities
  • Ans 2: 2: After heating metals becomes soft and flexible
    3: Metals have ability to make positive ions by losing electrons
    Na➜ Na +1e
    4: They react with oxygen and produce basic oxides
    4Na +O2➜2Na2O
  • Ans 3: Nin-metal :
    1: Solid non-metals are brittle
    2:They have low densities
  • Ans 4: 3: Non-metals have ability to make negative ions by gaining of electrons
  • Ans 5: 4: They react with oxygen and produce acidic oxides
    C+O2➜CO2
    S+O2➜SO2
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 5

Question # 1

Why the rate of diffusion of gases is rapid than that of liquid ?

  • Ans 1: The rate of diffusion of gases is rapid than that of liquid because the movement of gas molecule is rapid as compared to liquid , So due to random motion and collision gases diffuses rapidly
  • Ans 2:
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 6

Question # 1

What type of covalent bond is formed in nitrogen molecule?

  • Ans 1: In nitrogen molecule. three bond pairs are involved in bond formation. This type is called triple covalent bond. Three small lines are used to indicate these three pairs of electrons between those atoms in the molecules of such compounds.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 7

Question # 1

Write down the name of four least reactive metals .

  • Ans 1: The names of least reactive metals are following
  • Ans 2: 1: Gold
  • Ans 3: 2: Silver
  • Ans 4: 3:Platinim
  • Ans 5: Copper
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 8

Question # 1

How many electrons will be in M-shell of an atom having atomic number 15 ?

  • Ans 1: K L M
    2 8 5
    5 electrons are present in M shell of an atom having atomic number 15
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 9

Question # 1

How platinum is used as a catalyst in automobiles?

  • Ans 1:
    Platinum and rhodium are used as catalyst convertor
    Advantages : They convert most of the gases being emitted by vehicles into less harmful carbon dioxide , nitrogen and water vapour

Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 10

Question # 1

What are electrolytic cell ?

  • Ans 1: Electrolytic cell : The type of electrochemical cell in which the non-spontaneous chemical reaction is carried out with the help of electric current is called electrolytic cell
  • Ans 2: Example : Down's cell, Nelson's cell
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 11

Question # 1

Define transition temperature . Give example .

  • Ans 1: The temperature at which one allotropes changes into another is called is called transition temperature
  • Ans 2: Example: Transition temperature of sulphur is 96°CSulphur exists in rhombic form under 96°C it changes in monoclinic form . After this temperature i-e 100°C sulphur exists in monoclinic form
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 12

Question # 1

How platinum is used as a catalyst in automobiles?

  • Ans 1:
    Platinum and rhodium are used as catalyst convertor
    Advantages : They convert most of the gases being emitted by vehicles into less harmful carbon dioxide , nitrogen and water vapour

Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 13

Question # 1

What are electrolytic cell ?

  • Ans 1: Electrolytic cell : The type of electrochemical cell in which the non-spontaneous chemical reaction is carried out with the help of electric current is called electrolytic cell
  • Ans 2: Example : Down's cell, Nelson's cell
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 14

Question # 1

Give chemical reaction of H2 and Cl2 and l2Reaction of H2 with Cl2 :

  • Ans 1:
    H2 reacts with Cl2 only in the presence of sunlight
    H2 + Cl2 ➜ 2HCL
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 15

Question # 1

Define transition temperature . Give example .

  • Ans 1: The temperature at which one allotropes changes into another is called is called transition temperature
  • Ans 2: Example: Transition temperature of sulphur is 96°CSulphur exists in rhombic form under 96°C it changes in monoclinic form . After this temperature i-e 100°C sulphur exists in monoclinic form
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 16

Question # 1

Why elements are called s and p block elements ?

  • Ans 1: Elements are called s and p block elementsbecause their last element is present in s and p sub shell
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 17

Question # 1

How sodium metal is obtained from fused sodium chloride .

  • Ans 1: On the industrial scale molten sodium metal is obtained by the electrolysis of fused NaCl in the Down's cell . This electrolytic cell is a circular furnace . In the center of the furnace there is a large block of graphite , which acts as an anode while cathode around it is made of iron
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 18

Question # 1

What are metalloids ? Give two examples .

  • Ans 1: The elements whose properties are intermediate between metals and non-metals are called metalloids
  • Ans 2: Example Boron, Silicon, and etc
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 19

Question # 1

What is relation between electropositivity and ionization energy ?

  • Ans 1: Electropositivity is the reverse of the ionization energy . In the from from top to bottom ionization energy decreases and electropositivity increases
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 20

Question # 1

Define allotropy and give examples .

  • Ans 1: The existence of an element in more than one form in same physical state but different chemical properties is called allotropy .
  • Ans 2: Example : Oxygen has two allotropic forms :
  • Ans 3: 1: Molecular oxygen =O2
  • Ans 4: 2: Ozone = O3
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 21

Question # 1

Define halogens . give example .

  • Ans 1:
    Halogens : The element of group 17 called halogens
    Example : Chlorine , Fluorine , Bromine etc

Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 22

Question # 1

How is the periodicity of properties depends upon the number of proton in an atom ?

  • Ans 1: Periodicity of properties depends upon the atomic number . Atomic number is defined as total number of protons and nutron in a nucleus of any atom . That's the reason periodicity of properties depend upon protons
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 23

Question # 1

Write any two rules for assigning oxidation number .

  • Ans 1: 1: The oxidation number (O.N) of an ion consisting on a single element is the same as the charge on that ion .
  • Ans 2: 2: In any substance the more electronegative atom has the negative O.N
  • Ans 3: 3: In a neutral molecule , the sum of the O.N of all the elements is zero
  • Ans 4: 4: The sum of O.N in ion is equal to the charge present on ions
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 24

Question # 1

Why do ionic compound conduct electricity in solution form . Give reason

  • Ans 1: Ionic compounds are found in the form of positive and negative ions when they are in solution or molten form . When these programs are connected through a battery their ions create an opportunity for an electron (charges) to move rapidly and current begins to flow Therefore , this flow of current proved that ionic compounds are good conductors and they conduct electricity in solutions or molten form
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 25

Question # 1

In electroplating of chromium which salts is used as an electrolyte?

  • Ans 1: In electroplating of chromium, Cr2(SO4)3, is used as an electrolyte.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 26

Question # 1

Differentiate between boiling and melting point .

  • Ans 1: Melting point : The temperature at which the solid starts melting and exist in dynamic equilibrium with liquid state is called melting point
  • Ans 2: Boiling point : Boiling point is defined as the temperature at which the vapour pressure of a liquid become equal to the atmospheric pressure or any external pressure
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 27

Question # 1

Write two physical properties of non-metals.

  • Ans 1:
    1: Non-metals have less melting and boiling point (except diamond)
    2: They are generally soft (except diamond)

Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 28

Question # 1

Name the most abundant non- metal in earth's crust?

  • Ans 1: Oxygen has has the highest percentage in earth's crust 47% and oceans 86% but second highest percentage in atmosphere 21%
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 29

Question # 1

Give the composition of milk .

  • Ans 1: Milk is a mixture of calcium , water ,sugar , fat , proteins , minerals, salts , and vitamins
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 30

Question # 1

Describe at least two necessary conditions for the formation of covalent bond .

  • Ans 1: 1: A covalent bond is formed between two non-metals
  • Ans 2: 2: Electronegativity difference between combining atoms of non-metals must be very low
  • Ans 3: 3: The two combining atoms should have high ionization energy
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 31

Question # 1

Write down the electronic configuration of Al3+. How many electrons are present in its outer most shells

  • Ans 1: Al3+ = 1s2 ,2s2 ,2p6
  • Ans 2: K L
    2 8
  • Ans 3: In outermost shell of Al+3ion 8 electron are present
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 32

Question # 1

Write the names of noble metals .

  • Ans 1:
    The metals which give least reactions are called noble metals

Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 33

Question # 1

If 16g of oxygen contains 1 mole of oxygen atom, calculate the mass of one atom of oxygen in grams .

  • Ans 1: No of atoms in one mole =6.02×1023
  • Ans 2: The mass of6.02×1023 atoms =16 g
  • Ans 3: The mass of one atom is = 16/6.02×1023
    = 2.657 x 10-25g
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 34

Question # 1

Define carbondating .

  • Ans 1: 1: The radioactive isotopes are used to estimate the age of fossils like dead plants and animals and stones etc . The age determination of very old objects based on the half-lives of the radioactive isotopes is called radioactive isotopes is called radioactive-isotopes dating
  • Ans 2: 2: An important method of age determination of old carbon containing objects ( fossils ) by measuring the radio-carbon dating or simple carbon dating
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 35

Question # 1

Why the rate of diffusion gases is rapid than that of liquids ?

  • Ans 1: The rate of diffusion of gases is rapid than that of liquid due to the less attractive forces among the gas molecules than liquids . Gas molecule moves randomly and spread around
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 36

Question # 1

Define Triatomic molecule and polyatomic molecule

  • Ans 1: Polyatomic molecule : The molecules which consists of many atoms calledpolyatomic molecule
  • Ans 2: For example : C6H12O14 glucose N2H4 hydrazine
  • Ans 3: Triatomic molecule: The molecules which consists of three atoms called
    triatomic molecule
  • Ans 4: For example : H2O , CO2
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 37

Question # 1

Give the composition of earth crust with respect to three major elements .

  • Ans 1: Earth crust is formed by three major elements having following percentages
  • Ans 2: Oxygen 47%
    Silicon 28%
    Aluminum 7.8%
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 38

Question # 1

Describe endothermic reaction with example .

  • Ans 1: Endothermic reactions are those reactions in which heat is absorbed in theses reactions test tubes becomes cold
  • Ans 2: Example : Aqueous solution of Potassium nitrate ( KNO3 ) , Sodium nitrate (NaNO3) and Potassium chloride (KCL) are examples of endothermic reactions
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 39

Question # 1

Metals arc good conductor of electricity. Why?

  • Ans 1: Metals are good conductors of electricity because metals have free electrons which are mobile in nature. Spaces are present among the atoms. Mobile electrons can move freely in these spaces. (Fence, movement/flow of electrons is known as electricity that's why metals are good conductor of electricity.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 40

Question # 1

Why big size covalent molecules have high melting and boiling points?

  • Ans 1: Bigger molecules with three dimensional bonding form covalent crystals which are very stable and have high melting and boiling points.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 41

Question # 1

Define metal and give two examples .

  • Ans 1: The elements which have ability to lose electron and forms cations called metals like Na , K , Ca
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 42

Question # 1

Define aqueous solution . Write its components .

  • Ans 1: The solution which is formed by dissolving substance in water is called an aqueous solution . Water in the solution always in large amount and are called solvents
  • Ans 2: Example : Salt in water or sugar in water are two examples of aqueous solution
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 43

Question # 1

How is the periodicity of properties depends upon the number of proton in an atom ?

  • Ans 1: Periodicity of properties depends upon the atomic number . Atomic number is defined as total number of protons and nutron in a nucleus of any atom . That's the reason periodicity of properties depend upon protons
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 44

Question # 1

How many atoms are present in 16 g of O and 8g of S?

  • Ans 1: 16 grams of oxygen has 6.022 x 1023atoms and 8 grams of sulphur has 1.055x1023atoms.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 45

Question # 1

What is the reason of arranging elements in a group?

  • Ans 1: The reason of arranging of elements in a groups, is that they have same electronic configuration and same properties so they form a family.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 46

Question # 1

Can pure gold be used for making ornaments ? If not , why ?

  • Ans 1: Gold is too soft ,to be used as such . That is why it cannot be used aline in making ornaments . It is always alloyed with copper ,silver or some other metals
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 47

Question # 1

What is the difference between steel and stainless steel ?

  • Ans 1: Steel is a mixture while stainless steel is an alloy
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 48

Question # 1

What is transition temperature of sulphur?

  • Ans 1: Its transition temperature is 96℃.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 49

Question # 1

What is tyndall effect ? On which factor it depends ?

  • Ans 1: Tydnall effect: The particles of colloids are big enough to scatter the beam of light . It is called tydnall effect
  • Ans 2: Factors depends upon tydnall effect :
    It depends upon size of solute particles
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 50

Question # 1

State the nature and name of the substance formed by combining the following
1: Zinc + Copper
2: Water +Sugar
3: Aluminum +Sulphur
4: Iron + Chromium + Nickle

  • Ans 1: 1:Zinc + Copper
    It will be a mixture called a brass (alloy)
  • Ans 2: 2: Water + Sugar
    It will be a solution or mixture called sugar syrup
  • Ans 3: 3: Aluminum + Sulphur
    It will b a compound called aluminum sulphide
  • Ans 4: 4: Iron + Chromium + Nickle
    It will be a mixture called nichrome (alloy)
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 51

Question # 1

Which branch of chemistry deals with energy of atoms and its uses in daily life.

  • Ans 1: Nuclear chemistry deals with energy of atoms and its uses in daily life.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 52

Question # 1

Explain the effect of temperature on solubility .

  • Ans 1: 1: Temperature has major affect on the solubility of most of the substances
  • Ans 2: 2: Solubility of some substances increase by increasing temperature like KNO3 ,NaNO3.
  • Ans 3: 3: Solubility of some substances decreases by increasing temperature like LiSO4 , Ce2 (SO4) etc
  • Ans 4: 4: In some substance temperature does not affect solubility like NaCL
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 53

Question # 1

Differntiate between biochemistry and industrial chemistry .

  • Ans 1: Biochemistry : Biochemistry is the branch of chemistry in which w study the structure , composition , and chemical reaction of substances found in living organisms
  • Ans 2: Industrial chemistry : Industrial chemistry is the branch of chemistry that deals with the manufacturing of chemical compounds in commercial scale is called industrial chemistry
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 54

Question # 1

Give some examples of arsenic and silver .

  • Ans 1: Symbols of arsenic and silver are as following
  • Ans 2: Arsenic : (As) Silver : (Ag)
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 55

Question # 1

What is radical

  • Ans 1: An atom or a group of atoms that have some charge and keeps in contact during a chemical reaction is called a radical e.g. Hydronium H2O and carbonate CO3-2
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 56

Question # 1

Calculate the oxidation number of nitrogen in HNO3 .

  • Ans 1: HNO3 = (1) +(N) +3 (-2)
    = 1+N-6
    N = +5
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 57

Question # 1

Differentiate between nuclear chemistry and environmental chemistry .

  • Ans 1: Environmental chemistry:
    1 :The branch of chemistry in which we study about components of the environment and effect of human activity on the environment
    2 :it is also concerned with other sciences like biology, geology
    3: Save environment from pollution

  • Ans 2: Nuclear chemistry:
    1: The branch of chemistrythat deals with the radioactivity nuclear processes and properties
    2: The main concern of this branch is with the atomic energy and its uses in daily life
    3: It is used in radiotherapy , in the preservation of food and in industry


Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 58

Question # 1

Calculate the formula mass of the nitric acid .

  • Ans 1: HNO3 = 1+14+48
    = 63amu
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 59

Question # 1

State three reasons why do you think air is a mixture and water a compound

  • Ans 1: Air (mixture)
    1: Mixture is formed by the simple mixing up of the substances
    2: Air does not have a sharp and fixed melting point
    3: Air has heterogenous mixture composition
  • Ans 2: Water (Compound) :
    1: It is formed by the chemical combination of atoms of elements
    2: Water has a sharp and fixed melting point
    3: Water has homogenous composition
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 60

Question # 1

If an element has atomic number 13 and atomic mass 27 , how many electrons are there in each atom of the element?

  • Ans 1: Atomic number of an element (Z) =13
    Mass no.of an atom (A) =27
    A the total number of electrons in an atom is equal to its atomic number (Z) ,so it will have 3s electrons
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 61

Question # 1

What is the reason of deficiency of electrons in BF3?

  • Ans 1: In the formation ofBF3molecules , three valence electrons of boron (B) make three pairs of mutual coordination with three valance electrons from three fluorine atoms .. Despite of covalent bond made due to this mutual coordination , there is still deficiency of electron in boron . That's why octate is still incomplete (BF3)
  • Ans 2: Formation of coordinate covalent bond in BF3 and NH3, If an ammonia molecule (NH3) which has lone pair come close to the boron tri fluoride molecule (BF3) then ammonia give a lone pair to boron tri fluoride (BF3) to fulfil the deficiency of electrons . In this way NH3 become electron pair donor and BF3 become electron pair acceptor
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 62

Question # 1

Write down the name of any two elements which were discovered in early ages .

  • Ans 1: Following elements were discovered in early ages
  • Ans 2: 1: Crbon
  • Ans 3: 2: Gold
  • Ans 4: 3: Silver
  • Ans 5: 4: Copper
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 63

Question # 1

What is galvanic cell? Give an example .

  • Ans 1: The electrochemical cell in which a spontaneous chemical reaction takes place and generates electric current is called galvanic or voltaic cell
  • Ans 2: Example : Daniel cell
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 64

Question # 1

What elements do the following compound contains ?

  • Ans 1: Sugar ,common salt , lime water and chalk
  • Ans 2: Glucose :It contains carbon, hydrogen , and oxygen (C6H12O6)
  • Ans 3: Common salt : It contains sodium , and chlorine (NaCl)
  • Ans 4: Lime water : It contains calcium ,oxygen , and hydrogen Ca (OH)2
  • Ans 5: Chalk : It contains calcium ,carbon, and oxygen CaCO3
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 65

Question # 1

What are cathode rays ? Who discovered it?

  • Ans 1: In 1897 JJ Thomson discovered cathode rays
  • Ans 2: Cathode rays :

    1: These rays travel in a straight line perpendicular to the cathode surface
  • Ans 3: 2:They can cast a sharp shadow of an opaque object if placed in their path
  • Ans 4: 3: They are negatively charged
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 66

Question # 1

Classify the following into elements , compound and mixture ?
1: He and H2
2: CO and Co
3: Water and milk
4: Gold and brass
5: Iron and steel

  • Ans 1: Elements :
    He , H2 ,Co, Gold , Iron
  • Ans 2: Compounds :
    CO , H2O
  • Ans 3: Mixture :
    Milk , Brass , Steel
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 67

Question # 1

What is difference between electron affinity and electron -negativity ?

  • Ans 1: Electron affinity : Energy emitted due to the absorption of an electron in gaseous atom of an element is called electron affinity .
  • Ans 2: Example : F+ e➜ F△H =328KJ mol-1
  • Ans 3: Electron -negativity: The ability of an atom to attract the shared pair of electrons towards itself in a molecule is called electron -negativity
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 68

Question # 1

How is platinum used as a catalyst in automobiles and what are advantages of this use?

  • Ans 1: An alloy of platinum. palladium and rhodium is used as catalyst in automobiles as catalytic converter. It converts most of the toxic gases (CO, NO2) being emitted by vehicles into less harmful carbon dioxide. nitrogen and water vapour.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 69

Question # 1

What is relationship between Empirical formula and Molecular formula ?

  • Ans 1: The relationship between Empirical formula and Molecular formulais given as
    Molecular formula = (Empirical formula)*n
    When n = 1,2 ,3 and so on

  • Ans 2: Example:
    Molecular formula of benzene =C6H6 which is derived from the empirical formula CH when value of n = 6
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 70

Question # 1

Give difference between solution and colloids .

  • Ans 1: Colloids :
    The particles of colloids are large consisting of many atoms , ions , or molecules
  • Ans 2: Examples : Blood, milk , ink , jelly , toothpaste etc
  • Ans 3: Solutions : A solution is a homogenous mixture of two or more substances . The boundaries of components cannot be distinguished i-e a solution exists as one phase
  • Ans 4: Example : Sugar dissolved in water is an example of liquid solution
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 71

Question # 1

Define non polar covalent bond and give example .

  • Ans 1: Non polar covalent bond is formed between two similar atoms the hsred pair of electrons is attracted by both the atom equally
  • Ans 2: Example H2 , Cl2, O2 bonds
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 72

Question # 1

Which compounds of halogens are stable ?

  • Ans 1: Halogens form very stable compounds with alkali metals
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 73

Question # 1

Where sodium metal is obtained from fused sodium chloride .

  • Ans 1: Sodium metal accumulates at iron cathode in down's cell
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 74

Question # 1

What are cathode rays ? Who discovered it?

  • Ans 1: In 1897 JJ Thomson discovered cathode rays
  • Ans 2: Cathode rays :

    1: These rays travel in a straight line perpendicular to the cathode surface
  • Ans 3: 2:They can cast a sharp shadow of an opaque object if placed in their path
  • Ans 4: 3: They are negatively charged
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 75

Question # 1

What is the nature of charge on cathode ray ?

  • Ans 1: Cathode rays are deflected toward positive plate in an electric field showing that they are negatively charged
  • Ans 2: These rays are originated from cathode of discharge tube
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 76

Question # 1

Define metallic character .

  • Ans 1: The property of a metal to loose its valence electrons to form a positive ion is called metallic character
  • Ans 2: Na➜ Na+ +1e-
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 77

Question # 1

In which branch of chemistry behaviour of gases and liquid is studied?

  • Ans 1: The behaviour of gases and liquids is studied in the branch of chemistry called physical chemistry.
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 78

Question # 1

Name the metal which is least conductor of heat ?

  • Ans 1: Lead is a metal which is least conductor of heat
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 79

Question # 1

Why is 02 necessary for rusting?

  • Ans 1: 02 is necessary for rusting because it acts as oxidizing agent. It first oxidize iron-to Fe+2 ion thus Fe+ ion to rust (Fe203.n H2O) in the presence of water.
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 80

Question # 1

Write the name of two non-polar solvents .

  • Ans 1: Toluene and benzene aretwo non-polar solvents
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 81

Question # 1

Why noble gases are non-reactive?

  • Ans 1: The noble gases do have 2 or 8 electrons in their valence shells. It means all the noble gases have their valence shells completely filled. Their atoms do not have vacant space in their valence, shell to accommodate extra electrons. Therefore noble gases do not gain. lose or share electrons. that's why they are non - reactive
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 82

Question # 1

What are trends of ionization energy in periodic table ?

  • Ans 1: Ionization energy increases from left to right in the period while it decreases from to bottom in a group
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 83

Question # 1

How can you justify that air is a homogeneous mixture. Identify substances present in it?

  • Ans 1: Air is a mixture formed by be the physical mixture of the substances like nitrogen, oxygen, carbon dioxide, noble gases and moisture and it has same composition throughout. So,it is homogenous mixture.
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 84

Question # 1

Write down the reaction of magnesium with oxygen . How oxygen reacts with magnesium ?

  • Ans 1: Magnesium reacts with oxygen and magnesium oxide is formed
  • Ans 2: 2Mg +O2➜ MgO
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 85

Question # 1

Why do atoms react ?

  • Ans 1: It is an universal rule that everything in this world tends to become more stable . Atoms achieve stability by attaining electronic configuration of inert gases (He ,Ne ,or Ar ) . Having 2 or 8 electrons in the valence shell is sign of stability . Attaining two electrons in the valence shell is called duplet rule while attaining 8 electrons in the valence shell is called octet rule
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 86

Question # 1

What is the principle of electroplating ?

  • Ans 1: Principle of electroplating is to establish an electrolytic cell in which anode is made of the metal to be deposited and cathode of the object on which metal is to deposit . The electrolyte is an aqueous solution of salt of the respective metal
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9th class Chemistry Chapter 1 Preparation

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