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

What are application of inorganic chemistry.

  • Ans 1: It has application is every aspect of chemical industry such as glass, cement, ceramics and metallurgy.
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

What are application of inorganic chemistry.

  • Ans 1: It has application is every aspect of chemical industry such as glass, cement, ceramics and metallurgy.
Submit

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

Question # 1

is the mass of 1 mole of Oxygen and 1 mole of Sulphur same.

  • Ans 1: No, the mass of 1 mole of oxygen and 1 mole of sulphur atom is not same.
Submit

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

Question # 1

Why the density of a gas is measured in gdm-3while that of a liquid is expressed in gcm-3?

  • Ans 1: The density of a gas is measured in gdm-3while that of a liquid is expressed in gcm-3because gases have large volume which is measured by large unit dm3while liquid has less volume so it is measured by small unit cm3
Submit

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

Question # 1

How many neutrons are present in C-12 and C-13 ?

  • Ans 1: C-12 C-13
    P=6 P=6
    N=12-6=6 N=13-6=7
Submit

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

Question # 1

Why the electrons move freely in metals ?

  • Ans 1: This is because the valence shell electrons loosely held by nucleus of an atom . There is the weak force of attraction present between nucleus and the mobile valence electrons . Therefore valence electrons move freely in metals
Submit

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

Question # 1

What is redox reaction ?

  • Ans 1: The reaction in which simultaneously oxidation and reduction takes place is called redox reaction
Submit

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

Question # 1

What is atomic number, how it is represented?

  • Ans 1: "The atomic number of an element is equal to the number of protons present in the nucleus of its atoms." Representation:It is represented by "Z"
Submit

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

Question # 1

What is the significance of the symbol of an element ?

  • Ans 1: Symbol means identification , in chemistry it is used for the representation of chemical name of an element . In chemical equation whole name of an element is difficult to write , because the formula or chemical equation becomes too lengthy . Thus symbol makes an easy representation and understanding in this case
Submit

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

Question # 1

Convert -45°C to kelvin temperature .

  • Ans 1: (T)K = (T)°C +273
    (T)K = (-45)°C +273
    (T)K = (-45+ 273)°C
    (T)K = 228

Submit

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

Question # 1

Define isotope ?

  • Ans 1: Isotopes are defined as the atoms of elements that have same atomic number but different mass number
Submit

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

Question # 1

Write two properties of crystalline solids .

  • Ans 1: 1: In crystalline solids particles are arranged in definite in definite pattern .
  • Ans 2: 2: They have definite geometrical shape
  • Ans 3: 3: They have sharp melting point
Submit

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

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 13

Question # 1

Write two properties of gases

  • Ans 1: 1: Molecules of gases are always in state of continuous motion . They have very high K.E .
  • Ans 2: 2: Gases have very low density therefore , they have large volume
Submit

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

Question # 1

Define formula mass and formula unit .

  • Ans 1: Formula unit : formula unit is defined as the simplest whole number ratio of ions ,as present in the ionic compounds
  • Ans 2: Example : Formula unit of common salt consists of one Na+ and one Cl- ion
  • Ans 3: Formula mass:formula mass is the sum of atomic masses of all the atoms present in one formula unit of a substance
  • Ans 4: Example : formula mass of sodium chloride is 58.5 amu
Submit

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

Question # 1

Why arc the densities of gases tower than that of liquids?

  • Ans 1: Gases has e low density than liquids and solids. It is due to light mass and more volume occupied by the gas molecules.
Submit

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

Question # 1

Define ionic bond and ionic compounds .

  • Ans 1: Ionic bond : The type of chemical bond which is formed due to complete transfer of electron from one another is called ionic bond
  • Ans 2: Ionic compound : Ionic compound is composed of positively and negatively charged ions
Submit

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

Question # 1

Difference between substance and mixture.

  • Ans 1: Substance: A piece of matter in pure form is termed as substance.
    e.g. Glucose (C6H12O6) Oxygen
Submit

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

Question # 1

Define empirical formula and give example .

  • Ans 1: It is the simplest whole number , ratio of atoms present in a compound
  • Ans 2: Example : Empirical formula of benzene (C6H6) is CH
    Empirical formula of hydro peroxide (H2O2 ) is HO
Submit

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

Question # 1

Explain why are oxygen and hydrogen considered elements whereas water as a compound ?

  • Ans 1: Hydrogen and oxygen are element because
    1: Each one of it consists of same type of atoms

  • Ans 2: 2: Each of it has same atomic number
  • Ans 3: Water is a compound because :
    1: It consists of different types of atoms combined together in a fixed proportion by mass
    2: Properties of water are entirely different from its constituent components For example : water exists as liquid while hydrogen and oxygen exists as gases at room temperature
Submit

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

Question # 1

Write electronic configuration of Neon and Berylium

  • Ans 1: Atomic number of Neon 10
  • Ans 2: 10N = 1s2 , 2s2 , 2p6
  • Ans 3: Atomic number ofBerylium is4
  • Ans 4: 4Be = 1s2 , 2s2
Submit

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

Question # 1

Define atom according to Dalton ?

  • Ans 1: Atom is an indivisible , hard ,dense and sphere
Submit

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

Question # 1

What is the empirical formula of acetic acid ? Calculate its molecular mass.

  • Ans 1: Empirical formula of acetic acid CH2O
  • Ans 2: Molecular mass of acetic acid:
  • Ans 3: CH3COOH=2(12)+4(1)+16(2)
    =24+4+32
    =60a.m.u
Submit

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

Question # 1

Does Kelvin scale show negative temperature?

  • Ans 1: No. Kelvin scale does not show a negative temperature
Submit

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

Question # 1

What is maximum capacity of a metal ?

  • Ans 1: 1: K shall can accommodate 2 electrons
  • Ans 2: 2: L shall can accommodate 8 electrons
  • Ans 3: 3: M shall can accommodate 18 electrons
  • Ans 4: 4: N shall can accommodate 32 electrons
  • Ans 5: O shall can accommodate 50 electrons
Submit

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

Question # 1

Define Dynamic equilibrium ?

  • Ans 1: When the rate of evaporation becomes equal to rate of condensation . At that stage the number of molecules evaporating will be equal to the number of molecules coming back (condensing) to liquid . This state is called Dynamic equilibrium
Submit

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

Question # 1

Why do the isotopes of an element have different atomic number masses?

  • Ans 1: As isotopes of an element have same atomic mass . Mass number depends upon number of protons and neutrons . Isotopes of an element have the same number of proton but only differ in their neutrons number
Submit

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

Question # 1

Can, you cool a gas by increasing its volume

  • Ans 1: No. we cannot cool a gas by increasing its volume
Submit

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

Question # 1

How many blocks are present in periodic table ?

  • Ans 1: There are4 presentin periodic table called s, p, d and f block
Submit

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

Question # 1

Define oxidation and reduction reaction .

  • Ans 1: Oxidation: Oxidation is defined as addition of oxygen or removal of hydrogen or electron during a chemical reaction
  • Ans 2: Example : 1: Zinc is oxidized by the removal of two electrons
    Zn➜ Zn2+ + 2e
    2: Fe2+ is oxidized by the removal of one electrons Fe+2➜Fe+3 +1e
  • Ans 3: Reduction : Reduction is defined as addition of hydrogen or electron or removal of oxygen during a chemical reaction
  • Ans 4: Example : Addition of hydrogen
    H2S + Cl2➜ S+ 2HCL
    Reduction of oxygen :
    2ZnO + C➜ 2Zn + CO2
Submit

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

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 31

Question # 1

How was it shown that atomic nuclei are positively charged ?

  • Ans 1: The deflection of a few particles proved that there is a center of positive charge in an atom , , which is called nucleus of an atom
Submit

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

Question # 1

Write any two uses of sodium .

  • Ans 1: 1:Sodium potassium alloy is used as a coolant in nuclear reactor
  • Ans 2: 2: It is used to produce yellow light in sodium vapour lamps
Submit

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

Question # 1

Write electronic configuration of Boron .

  • Ans 1: Atomic no of Boron 5
  • Ans 2: 5B =1s2. 2s2, 2p1
Submit

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

Question # 1

Why atomic mass of an atom is defined as relative atomic mass?

  • Ans 1: ATomic mass of an atom is defined as relative atomic mass, because atomic mass of an atom is the mass which compares or relates with 1/12th mass of carbon 12 isotope.
Submit

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

Question # 1

Why ionization energy of Na is less than Mg ?

  • Ans 1: Ionization energy of Na is less than Mg because Mg has greater nuclear charge than Na and also have smaller size
  • Ans 2: Na➜ Na++ e△11 = 495Jmol-1
    Mg➜ Mg+ +e△11 = 738Jmol-1
Submit

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

Question # 1

In which branch of chemistry deals with preparation of paints and papers?

  • Ans 1: "Industrial chemistry deals with preparation of paints and papers".
Submit

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

Question # 1

What are difference between string and weak electrolytes .

  • Ans 1: Strong electrolyte : The substance which ionizes completely in solution to produce more ions which can conduct strongly is called strong electrolyte
  • Ans 2: Example : NaCl , NaOH , H2SO4 etc
  • Ans 3: Weak electrolyte : The electrolytes which produce less ions and mostly remained unionized in aqueous solution called weak electrolytes
  • Ans 4: Example CH3COOH (Acetic acid)
Submit

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

Question # 1

What is the relationship between atomic number and atomic mass?

  • Ans 1: The relationship between atomic number and atomic mass is as following. A = Z = n Where A = mass number Z = Atomic number n= no of neutrons
Submit

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

Question # 1

Write down four important chemical properties of metals .

  • Ans 1: 1: Metals easily lose electron and form positive ions
    Na➜ Na +1 +le-
  • Ans 2: 2: Metals reacts with oxygen and forms metallic oxides that have basic nature .
  • Ans 3: 3: Metals have metallic bonding
  • Ans 4: 4: When metals reacts with non-metals they form ionic compounds
Submit

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

Question # 1

Define pascal .It is the unit of which quantity ?

  • Ans 1: If one newton force is applied on 1m2area then pressure is called one pascal . It is unit of pressure
  • Ans 2: Unit : 1 Pa = 1N/1m2
    = Nm-2
Submit

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

Question # 1

Define alloy and give example .

  • Ans 1: Alloy : alloy is a homogeneous mixture of one metal with one or more metals or non-metals
  • Ans 2: Example : The best example of alloy is 'stainless steel'
Submit

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

Question # 1

What type of elements have tendency of sharing of electrons?

  • Ans 1: If bond formation is between similar atoms or between the atoms that have comparable electronegativities. then the chemical bond formation is by sharing of electrons
Submit

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

Question # 1

Why HF is a weak acid ?

  • Ans 1: HF is a weak acid because in HF -compound . There is strong intermolecular bonding . So, it does not readily ionize in water and release H+ in water the strong acid is that which is readily ionized in water but HF does not easily ionized in water
Submit

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

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 45

Question # 1

What is an electron affinity ? Give an example .

  • Ans 1: Trend in a group : In a group electron affinity values decreases from top to bottom because the size of an atom increases down the group . With the increase in size of atom shielding effect increase that results in poor attraction for the incoming electron i-e less energy is released out
  • Ans 2: For example : as the size of iodine atom is bigger than chlorine , its electron affinity is less than chlorine
  • Ans 3: Trend in a period : Electron affinity values increases from left to right in the period . Because the size of atoms decreases as a result the attraction of the nucleus for incoming electron increases and increase the electron affinity
Submit

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

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 47

Question # 1

Define relative atomic mass .

  • Ans 1: Relative atomic mass of an element is the average masses of atoms of that element as compared to 1 / 12th the mass of one atom of carbon -12 isotope
  • Ans 2: Example :
    Mass of Na = 23 amu
    When atomic mass unit is expressed in grams , it is :
    1 amu = 1.66x 10-24 g
  • Ans 3: Example :
    Mass of a proton = 1.0073 amu or 1.672 x 10-24 g
    mass of neutron = 1.0087 amu or 1.674 x 10-24g
  • Ans 4: Mass of electron = 5.486 x 10-24 amu or 9.106 x 10-28 g
Submit

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

Question # 1

How does electron differ from a neutron ?

  • Ans 1: Electron
    1: Electrons have negative charge
    2: The mass of the electron is 1940 times less than proton
  • Ans 2: Neutron:
    1: Neutron carry no charge
    2: Mass of neutron nearly equal to the mass of the proton
Submit

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

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
Submit

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

Question # 1

What type of elements have tendency of sharing of electrons?

  • Ans 1: If bond formation is between similar atoms or between the atoms that have comparable electronegativities. then the chemical bond formation is by sharing of electrons
Submit

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

Question # 1

What is the capacity of the K,L,M,N shells ?

  • Ans 1: K shell can accommodate 2 electron
    L shell can accommodate 8 electrons
    M shell can accommodate 18 electrons
    N shell accommodate 32 electrons
Submit

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

Question # 1

Write two properties of liquid state of matter

  • Ans 1: 1: Liquid have fixed volume but no fixed shape . It attains the shape of container in which it is kept
  • Ans 2: 2: The particles of liquid are much farther a part than those of solids
Submit

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

Question # 1

Why the elements of group 13 to group 18 are called P block elements ?

  • Ans 1: Elements of group 13 to 18 have their valence electrons in P subshell . Therefore , they are called as P-block elements
Submit

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

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 55

Question # 1

An element has 5 electrons in M shell . Find its atomic number

  • Ans 1: The element has 5 electrons in M shell has atomic number 15 and name of element is phosphorous
Submit

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

Question # 1

Why HF is a weak acid ?

  • Ans 1: HF is a weak acid because in HF -compound . There is strong intermolecular bonding . So, it does not readily ionize in water and release H+ in water the strong acid is that which is readily ionized in water but HF does not easily ionized in water
Submit

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

Question # 1

Two hydrogen atoms combine to form molecules H2 while 'He' atom remains monatomic . Explain ?

  • Ans 1: Two hydrogen atoms combine to form molecules H2 while 'He' atom remains monatomic because the outer most shell of hydrogen is incomplete . On the other hand outer most shell of He is complete
Submit

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

Question # 1

What is meant by metallic bond ?

  • Ans 1: When positively charged metal ions are held together by freely moving electrons , the bond which is formed called metallic bond
Submit

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

Question # 1

Give two characteristics of colloid .

  • Ans 1: 1: Colloid particles are large but can't be seen with naked eyes
  • Ans 2: 2: Colloids particles are big but they can pass through a filter paper
  • Ans 3: 3: Colloids exhibit the tyndall effect
Submit

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

Question # 1

Write down electronic configuration of phosphorous .

  • Ans 1: Atomic number of phosphorous is 15 Electronic configuration is given as below :
  • Ans 2: 15P = 1s2 , 2s2 , 2p6 , 3s2 , 3p3
Submit

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

Question # 1

What is the half cell reactions occuring on cathode and anode in Daniel cell ?

  • Ans 1: Following reactions occur at cathode and anode in Daniel cell .
  • Ans 2: Anode : Half-cell reaction at anode is oxidation reaction
    Zn(s)➜ Zn +2 (aq) + 2e-
  • Ans 3: Cathode : Half cell reaction at cathode is reduction reaction .
    Cu2+ (aq) +2e-➜ Cu (s)
Submit

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

Question # 1

Why is HF a weak acid ?

  • Ans 1: HF less ionizes , hydrogen bond is present between its molecules . That is why it is a weak acid
Submit

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

Question # 1

What is difference between steel and stainless steel ?

  • Ans 1: Steel : Alloy of iron with other metals called steel
  • Ans 2:
    Stainless steel : Alloy of iron and chromium is called stainless steel

Submit

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

Question # 1

Which metal is used for metal work?

  • Ans 1: As the metal work. means fire work. The metals are used in fire work due to its characteristic flame colour when they ignite in air . Na"- give golden colour, "Ca" give red colour etc.
Submit

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

Question # 1

Which six elements constitute 99% of body mass and what are their percentages ?

  • Ans 1: Following six elements constitute 99%of body mass
    Oxygen 65%
    Hydrogen 10%
    Calcium 1.5 %
    Carbon 18%
    Nitrogen 3%
    Phosphorous 1.5%
Submit

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

Question # 1

What is matter ? How many states it has ?

  • Ans 1: Matter is any thing that has mass and occupies space .
  • Ans 2: State of matter :
    1: Solid
  • Ans 3: 2: Liquid
  • Ans 4: 3: Gas
Submit

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

Question # 1

Write two properties of platinum.

  • Ans 1:
    1: Platinum is a noble metal and very least reactive
  • Ans 2: 2: Platinum metal has characteristics colir , beauty , strenght elasticity and lust
Submit

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

Question # 1

What is the empirical formula of acetic acid ? Calculate its molecular mass.

  • Ans 1: Empirical formula of acetic acid CH2O
  • Ans 2: Molecular mass of acetic acid:
  • Ans 3: CH3COOH=2(12)+4(1)+16(2)
    =24+4+32
    =60a.m.u
Submit

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

Question # 1

Define Chemistry?

  • Ans 1: The Branches of Science which deals with the composition, structure, properties and reactions of matter is called chemistry.
Submit

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

Question # 1

Why the electrons move freely in metals ?

  • Ans 1: This is because the valence shell electrons loosely held by nucleus of an atom . There is the weak force of attraction present between nucleus and the mobile valence electrons . Therefore valence electrons move freely in metals
Submit

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

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 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

Define empirical formula and give example .

  • Ans 1: It is the simplest whole number , ratio of atoms present in a compound
  • Ans 2: Example : Empirical formula of benzene (C6H6) is CH
    Empirical formula of hydro peroxide (H2O2 ) is HO
Submit

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

Question # 1

How will you compare he electropositivity ok alkali metals and alkaline earth metals ?

  • Ans 1:
    :Alkali metal
    These are highly electropositive. They have highly ionization energy values ranging from 520k.Jmol 1 for Li to 376 k.Jmol 1 for CS
    Alkaline earth metal :They have less ionization energy values ranging from 1787k.Jmol 1 for Be to 936 k.Jmol 1 for Ba

Submit

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

Question # 1

Why electro positivity decreases from left to right in a period?

  • Ans 1: Electropositivity decreases across the period from left to right. It means elements in the start of periodic are more metallic. This is because of two reasons,
    (i) Size of atoms decreases.
    (ii) Nuclear charges increases. upon nuclear charge. If nuclear charge increases the Electropositivity decreases because it becomes difficult to remove the electrons from outermost shell
Submit

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

Question # 1

Differentiate between atom and ion ?

  • Ans 1: Atom :
    1: It is the smallest particle of an element
    2: It can or cannot exists independently and can take part in a chemical reaction
    3: It is electrically neutral
  • Ans 2: Ion:
    1: It is the smallest unit of an ionic compound
    2: It cannot exists independently and is surrounded by oppositely charged ions
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 77

Question # 1

Write name of any two elements found in gaseous state

  • Ans 1: Nitrogen and oxygen both found in gaseous state
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 78

Question # 1

In which form sulphur exists at I00°C?

  • Ans 1: Sulphur exists in monoclinic form at 100"C because at room temperature sulphur exists in rhombic form. The transition temperature of sulphur is 96"C at which rhombic sulphur convened into monoclinic form.
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 79

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 80

Question # 1

Why shielding effect of electron makes action formation easy ?

  • Ans 1: As we move down in a group more and more shells come come between valence shell and the nucleus of atom , additional shell reduce the electrostatic force of attraction felt by the electron present in the outermost shell , and the shielding effect increases resultantly , and the electrons can be taken away , easily and cations form
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 81

Question # 1

Write down uses of radioactive isotopes as traces for diagnosis and medicine .

  • Ans 1: 1: The radioactive isotopes are used as tracer to diagnose the presence of tumor inside the body
  • Ans 2: 2: Isotopes of iodine I - 131 is used to diagnose the goiter in thyroid gland . Technetium is used to monitor bone growth
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 82

Question # 1

What types of electron pairs make a molecule good donor ?

  • Ans 1: The lone pair of electron make a molecule a good donor
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 83

Question # 1

Why is vapour pressure higher at high temperature?

  • Ans 1: At high temperature, vapour pressure is higher than at low temperature. At elevated temperature, the Kinetic energy of the molecules increases enough to enable them to vaporize and exert pressure.
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 84

Question # 1

What are the uses of nuclear chemistry ?

  • Ans 1: It has vast application in medical treatment , preservation of food , and generation of electrical power nuclear reactors
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 85

Question # 1

Define chemistry ? Explain two branches of chemistry .

  • Ans 1: Chemistry : The Branch of science which deals with the composition , structure, properties and reaction of matter is called chemistry
  • Ans 2: Branches of chemistry

  • Ans 3: Physical chemistry : Physical chemistry is defined as the relationship between the composition and physical properties of matter , along with the changes in them
  • Ans 4: Nuclear chemistry : It is the branch of chemistry that deals with the radioactivity , nuclear processes and their properties
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9th Class Chemistry English Medium Chapter 1 Preparation - Set 86

Question # 1

Convert -30°C to K unit

  • Ans 1: As we know that
    (T)k = (T)°C +273
    By putting°C=-30°
    (T)k = (-30)°C +273
    (T)k = (-30+273)°C
    (T)k = 243°C


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Chemistry
1st Unit

9th class Chemistry Chapter 1 Preparation

Here you can prepare 9th chemistry chapter 1 online Short Questions Preparation (Unit 1 Fundamentals of Chemistry). Click the button for 100% free full practice test.

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