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.

+ View More detail
9th Class Chemistry Chapter 1 Online Preparation
Start Chemiatry Unit 1 Preparation
ic

9th Class English Medium Subjects

icon
Computer Science
icon
Chemistry
icon
Biology
icon
Mathematics
icon
General Science
icon
General Maths
icon
Physics
icon
English
icon
Urdu
icon
Islamiat
icon
Pakistan Study

9th Class Urdu Medium Subjects

icon
Islamiat
icon
Pakistan Study
icon
Urdu
icon
English
icon
Islamiat Elective
icon
Punjabi
icon
Chemistry
icon
Biology
icon
Education
icon
Mathematics
icon
General Science
icon
Home Economics
icon
Computer Science
icon
General Mathematics
icon
Physics
icon
Civics

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

Start Test Download PDF

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

Question # 1

What is vapour pressure ?

  • Ans 1: The pressure exerted by the vapour of a liquid at equilibrium with the liquid at a particular temperature is called vapour pressure of liquid
  • Ans 2: At high temperature vapour pressure is higher than at low temperature and K.E molecule increase
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 is vapour pressure ?

  • Ans 1: The pressure exerted by the vapour of a liquid at equilibrium with the liquid at a particular temperature is called vapour pressure of liquid
  • Ans 2: At high temperature vapour pressure is higher than at low temperature and K.E molecule increase
Submit

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

Question # 1

Give chemical reaction of methane with chlorine in bright light .

  • Ans 1:
    In bright light (sun light) Cl2 react with CH4 violently and explosively
    Chemical reaction : CH4 +2Cl2 ➜ C+4HCL
Submit

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

Question # 1

Give the characteristics properties of ionic compounds

  • Ans 1: the characteristic properties of ionic compounds. %Its: Characteristic Properties of Ionic Compounds: (I) lanai compounds are mostly crystalline solids. In I Ionic compounds in solid state have negligible electrical conductance but they are good conductors in solution and in the molten form. It is due to presence of free inns in them. lilt) Ionic compounds have high melting and boiling point example. NaCI has M.P. 800°C and B.P. 1413°C. (iv) Ionic compounds dissolves in polar solvents. Like NaCI dissolves in water.
Submit

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

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.
Submit

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

Question # 1

Give the scope of biochemistry .

  • Ans 1: It is the branch of chemistry in which we study the structure , composition and chemical reaction of substances found in living organisms . It covers all chemical processes taking place in living organisms . Such as synthesis and metabolism of bio molecules like carbohydrates , proteins and fat . Biochemistry emerged as separate discipline when scientists began to study how living things obtain energy from food or how the fundamental biological changes occur during a disease . Examples of applications of biochemistry are in the fields of medicine , food science and agriculture etc
Submit

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

Question # 1

In electroplating of silver , from which electrolyte Ag+ comes and where they deposit ?

  • Ans 1: In the electrolyte of silver (Ag)+ comes from anode and deposit on cathode .
Submit

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

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 8

Question # 1

Metals are good conductors of electricity .Why ?

  • Ans 1: Metals have free moving electrons called mobile electrons . Due to presence of these electrons metals are good conductors of electricity
Submit

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

Question # 1

The atomic symbol of a phosphorous ion is given as 3115P3-
a : How many protons , electrons , and neutrons are there in ion3115P3- ?
b: What is the name of ion ?
c:Draw electronic configuration of ion .
d: Name noble gas which has some electronic configuration as phosphorous ?

  • Ans 1: Proton = 15
    Electron = 18
    Neutron = 16
    b: Phosphorous ion
    c: E.C =1s2 , 2s2 , 2p6 , 3s2 ,3p6
  • Ans 2: d: Argon = 18 (Ar 18 ) has some electronic configuration as phosphorous ion
Submit

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

Question # 1

Write down names of two very reactive metals .

  • Ans 1: 1: Li (Lithium)
  • Ans 2: 2: Na (Sodium)
Submit

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

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 12

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 13

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 14

Question # 1

What type of attractive forces exist between HCL molecules ?

  • Ans 1: Dipole-dipole attractiveforces exist between HCL molecules.
Submit

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

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 16

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 17

Question # 1

What are weak electrolytes? . Give example .

  • Ans 1: The substances which ionize to a small extent when dissolved in water and could not produce more ions are called weak electrolytes
  • Ans 2: Example : CH3COOH and Ca (OH)2 ionize to a small extent in aqueous solution . Therefore these are weak electrolytes
Submit

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

Question # 1

What is meant by ion ? Give example .

  • Ans 1: Ion is an atom or group of atoms having a charge on it .
  • Ans 2: For example , sodium Na+ and potassium K+ both are ions
Submit

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

Question # 1

What do you mean by group or median in periodic table ?

  • Ans 1: The horizontal rows in periodic table called periods and vertical columns in the periodic table are called groups
Submit

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

Question # 1

Convert 30°Cto kelvin temperature

  • Ans 1: We know that
    (T)K = (T)°C +273
    by putting the values of C°=30° we have
    (T)K = (30)°C +273
    (T)K = (30+273)°C
    (T)K = 303


Submit

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

Question # 1

What is diffusion ? Explain with example .

  • Ans 1: Diffusion : The process in which molecules more from the area of higher concentration move to the area of lower concentration until the state of equilibrium is achieved is called diffusion
  • Ans 2: Example : If we open perfume bottle in the corner of the room , the fragrance of perfume spread in whole room by diffusion
Submit

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

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 23

Question # 1

What is the sign of stability of an atom ?

  • Ans 1: The sign of stability of an atom IS achieving the electronic configuration similar to noble gases (He , Ne , or Ar etc) i-e (n2 p6 ) or having two or eight electrons in their valence shell . In other words an atom is called stable if it follows duplet or octet rule
Submit

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

Question # 1

Name the best ductile and malleable metal ?

  • Ans 1: Gold and silver
Submit

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

Question # 1

Write the name of two non-polar solvents .

  • Ans 1: Toluene and benzene aretwo non-polar solvents
Submit

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

Question # 1

Differentiate between lone pair and bond pair of electron.

  • Ans 1:
    Lone Pair
    The non-bonded electron pair available on an atom. like the one lone pair is available on nitrogen in ammonia is called a lone pair
  • Ans 2: Bond pair : The bonded electron pair available within the atoms is called a bond pair
Submit

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

Question # 1

What is the significance of chemical formula ?

  • Ans 1: 1: It represents the name of the substance e.g H2O (water)
  • Ans 2: 2: It also represents one mole of the molecules in the balance chemical equation
  • Ans 3: 3: It tells the name of the elements as present in the compound
  • Ans 4: 4: It indicates the mass of the compound in amu or grams
  • Ans 5: It is in fact one molecule or formula unit of the compound
Submit

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

Question # 1

Find out the mass of 3 moles of oxygen atoms .

  • Ans 1: 3x16 = 48g of oxygen are present in 3 moles
Submit

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

Question # 1

Define Electrochemistry.?

  • Ans 1: Electrochemistry is the branch of chemistry which deals with the relationship b-cl electricity and chemical reactions.
Submit

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

Question # 1

Write two properties of covalent compounds

  • Ans 1: 1: They have usually low melting and boiling points
  • Ans 2: 2:They are usually bad conductors of electricity . The compound having polar character in their bonding are conductor of electricity when they dissolve in polar solvents
  • Ans 3: 3: They are usually insoluble in water but are soluble in non-aqeous solvents like benzene , either alcohol and acetone
Submit

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

Question # 1

Determine the oxidation number of Mn in KMnO4.

  • Ans 1: {O.N k } + {O.N Mn } +4 {O.N O} =0
    {+1} + {O.N Mn } +4 {-2 } =0
    1+ {O.N Mn } 8=0
    O.N Mn = 8-1
    = 7
Submit

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

Question # 1

State the physical properties of sodium .

  • Ans 1: 1: Its melting point is 97°C
  • Ans 2: 2: Sodium is silvery white having a metallic lusture very soft and can be cut with knife
Submit

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

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 34

Question # 1

Define relative atomic mass.

  • Ans 1: Relative atomic mass of an element is the average mass of an atom of that element as compared to 1/12th the mass of atom of carbon-12 isotopes
Submit

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

Question # 1

Whether the density of gases increase on cooling ?

  • Ans 1: The density of gases increasing by cooling because their volume decreases and molecules of gases came close to each other
Submit

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

Question # 1

What is the relationship between electro positivity and ionization energy ?

  • Ans 1: Electronegativity depends upon the ionization energy which is in turn depends upon size and nuclear charge of the atom
  • Ans 2: 1: Small sized atom with high nuclear charge have high ionization energy
  • Ans 3: 2:Atoms having high ionization energy are less electropositive or metallic
Submit

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

Question # 1

Write down the chemical formula of silicon dioxide and calcium chloride .

  • Ans 1: Silicon dioxide SiO2
  • Ans 2: Calcium chloride CaCl2
Submit

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

Question # 1

Why does sodium form a chemical bond with chlorine ?

  • Ans 1: Sodium become Na by losing an electron and eight electrons remains in its valence shell . Chlorine gain an electron and becomes Cl-ion . Both these ions attract each other and become stable
  • Ans 2: Na + Cl➜NaCl
Submit

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

Question # 1

Write difference between homoatomic and heteroatomic molecules ?

  • Ans 1: Heteroatomic molecules:
    The molecules consisting of different types of atoms are called heteroatomic molecules
  • Ans 2: Example: H2SO4, SiO2 , HCl etc
  • Ans 3: Homoatomicmolecules:
    The molecules consisting of same types of atoms are called heteroatomic molecules
  • Ans 4: Example : H2 ,O2,O3,S8 etc
Submit

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

Question # 1

What is meant by molecular ion ?

  • Ans 1:
    When a molecule loses or gains one or more electron , it forms a molecular ion

  • Ans 2:

    Example : CH4
Submit

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

Question # 1

Define atomic mass unit . Why is it needed ?

  • Ans 1: The unit for relative , atomic mass unit
  • Ans 2: Symbol :Its symbol is amu
    One atomic mass unit is 1/12th the mass of one atom of carbon-12th the mass of an atom of carbom-12th. When this atomic mass unit is expressed in grams , it is : 1 amu = 1.66x10-24 g
Submit

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

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 43

Question # 1

Write electronic configuration of Aluminuim .

  • Ans 1: Atomic number of Aluminium is 13
    13Al = 1s2 , 2s2, 2p6, 3s2, 3p1
Submit

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

Question # 1

Which metals are the most malleable and ductile ?

  • Ans 1: Gold (Au) is the most malleable and ductile of all metals . One gram of gold can be drawn into a wire of one and called ductile
Submit

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

Question # 1

What is salt bridge ? What is its basic function ?

  • Ans 1: Galvanic cell consists of two half cells, both these half cells are connected by salt bridge
  • Ans 2: Structure of salt bridge : salt bridge is a U-shaped glass tube . It consists of saturated solution of strong electrolyte supported in a jelly type material . The ends of the U tube are sealed with the porous material like glass wool
  • Ans 3: Function of salt bridge : The function of the salt bridge is to keep the solution of two half cells neutral by providing a pathway for migration of ions
Submit

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

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 47

Question # 1

What is quantum ?

  • Ans 1: Quantum means fixed energy . It is the smallest amount of energy that can be emitted or absorbed as electromagnetic radiation
Submit

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

Question # 1

What do you mean by malleable and ductile ?

  • Ans 1: Malleability is the property by virtue of which metals can be drawn into sheets while ductility is the properties by virtue of which a metal can be drawn into wires
Submit

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

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 50

Question # 1

Define pressure and write its unit .

  • Ans 1: Pressure : It is defined as the force exerted by per unit surface area
  • Ans 2: Formula :P = F / A
  • Ans 3: Unit : Pressure has SI unit of Nm-2It is also called pascal (Pa)
Submit

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

Question # 1

Write two uses of isotopes

  • Ans 1: 1: In the field of medicine isotopes of iodine 131 are use for diagnose of goiter in thyroid gland
  • Ans 2: 2: When the nucleus of U-235 breaks a large amount of energy is released which convert water into steam in boilers and produce electricity
Submit

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

Question # 1

Why does evaporation cause cooling ?

  • Ans 1: When the high kinetic energy molecules evaporates from the surface of liquid , the temperature of the remaining molecules falls down . To compensate the energy decrease , the molecules absorb heat from surrounding falls down and we feel cooling
  • Ans 2: Example : When we put a drop of alcohol on palm it evaporates and our palms feels cold
Submit

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

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 54

Question # 1

Define hydrogen bonding ?

  • Ans 1: Th partially positive charged hydrogen atom of one molecule attracts and forms a bond with partially negatively charged atom of the other molecule the bonding is called hydrogen bonding
Submit

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

Question # 1

Define industrial chemistry and analytical chemistry ?

  • Ans 1: Industrial chemistry : It is the branch of chemistry that deals with the manufacturing of chemical compounds on commercial scale
  • Ans 2: Analytical chemistry : Analytical chemistry is the branch of chemistry deals with the separation and analysis of the sample to identity its components
Submit

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

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 57

Question # 1

Give example of two polar compounds and give their chemical formula .

  • Ans 1: Following are some examples of two polar compounds :
  • Ans 2: 1: Hydrochloric or Hydrogen chlorine (HCL)
  • Ans 3: 2: Water (H2O)
  • Ans 4: 3: Hydrogen fluoride (HF)
Submit

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

Question # 1

What do you mean like dissolve like ? Explain with example ?

  • Ans 1: The general principle of solubility is , like dissolve like
    1: The ionic and polar substance are soluble in polar solvents . ionic solids and polar covalent compounds are soluble in water e.g KCl , Na2CO3, CuSO4etc
  • Ans 2: 2: Non -polar substances are not soluble in polar solvents . Non polar covalent compounds are not soluble in water but dissolve in petrol and benzene etc
Submit

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

Question # 1

Name one solid, one liquid and one gaseous element present at room temperature?

  • Ans 1: Solid : Sodium, Iron Liquid: Bromine and Mercury Gas: Oxygen , Nitrogen, and Chlorine
Submit

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

Question # 1

Describe the number of molecules in 9 g water.

  • Ans 1: Volume of water = 9g
  • Ans 2: No of molecules in a gram of water = 9/18
    = 0.5 mole
  • Ans 3: No of molecules in 9g gram of water molecules = 0.5x6.02x10 23
    = 3.01x1023
Submit

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

Question # 1

Calculate the molecular mass of the carbon dioxide .

  • Ans 1: Molecular mass of the carbon dioxide
    CO2 = 12+2 (16)
    = 44amu
Submit

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

Question # 1

Which electrons are involved in chemical bonding?

  • Ans 1: Only valence shell electrons are involved in chemical bonding
Submit

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

Question # 1

Define groups ?

  • Ans 1: The vertical columns in periodic table are called groups . Numbered from 1 to 18
Submit

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

Question # 1

Write formulas of two ionic compounds which are soluble in water .

  • Ans 1: The two ionic compound which are soluble in water are following
  • Ans 2: Sodium chloride : NaCl
  • Ans 3: Sodium Thiosulphate : Na2S2O3
Submit

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

Question # 1

Describe difference between concentrated and dilute solution .

  • Ans 1: Concentrated solution : The solution which contains relatively large amount of dissolved solute in solution is called concentrated solution
  • Ans 2: Dilute solution : The solution which contain relatively smaller amount of dissolved solute in solution is called dilute solution
Submit

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

Question # 1

What is the empirical formula of acetic acid (CH3COOH)? Also calculate the molecular mass of acetic acid .

  • Ans 1: Empirical formula of acetic acid is CH2O
  • Ans 2: molecular mass of acetic acid (CH3COOH):
    Atomic mass of C =12 amu
    Atomic mass of H = 1 amu
    Atomic mass of O = 16 amu
    Molecular formula (CH3COOH)
    Molecular mass = 2 (At.Mass of C ) + 4(At,Mass of H ) +2 (At.Mass of O )
    =2(12) + 4(1) + 2(16)
    = 24 + 4 + 32
    = 60 amu
Submit

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

Question # 1

Write down two uses of gold .

  • Ans 1:
    Because of its inertness in atmosphere , it is an ornamental metal as well as used in making coins . Gold is too soft to be used as such
    It is always alloyed with copper, silver or some other metal
  • Ans 2:

Submit

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

Question # 1

how can you explain the solute-solvent interaction to prepare NaCI Solution?

  • Ans 1: When NaCI is added in water it dissolves readily because the attractive interaction between the ions of NaCI and polar molecules of water are strong enough to overcome the attractive forces between Na' and CI- ions in solid NaC1 crystal. In this process the positive end of the water dipole is oriented towards the CF ions and the negative end of water dipole is orwater molecules are so strong that they pull these ions from their positions in the the Na- ions. These ion dipole attractions between Na+ ions and water molecules, Cl- ions and water molecules are so strong that they pull these ions from their positions in the crystal and thus NaCl dissloves
Submit

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

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 70

Question # 1

What are the elements arranged in group 3 to 12 called ?

  • Ans 1: The groups 3 to 12 are called transition elements . In these elements 'd ' sub shell is in the process completion
Submit

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

Question # 1

How will you test whenever given solution is colloidal solution or not?

  • Ans 1: If the panicles scatter the path of light rays thus emitting the beam of light i.e exhibit the Tyndall effect than the given solution is colloid.
Submit

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

Question # 1

What is the shape of cathode in the Nelson's cell ? Why is it perforated ?

  • Ans 1: The cathode in Nelson's cell is U- shaped . It is perforated for the percolation of NaoH into a catch basin
Submit

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

Question # 1

What is the relationship between empirical formula and formula unit.

  • Ans 1: All the organic compounds are represented by formula unit. Formula unit is also and empirical formula of Ionic compounds.
Submit

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

Question # 1

Write the redox reaction taking place during the electroplating of chromium .

  • Ans 1: Chromium sulphate Cr(SO4)3 used as an electrolyte in the electroplating of chromium that provides CCr+3 ions which reduce and deposit at cathode
  • Ans 2: The following reactions take place at both electrodes
  • Ans 3: Reaction at anode : 4OH- (aq)➜ 2H2O (1) + O(1) +O2(g)+4e-
  • Ans 4: Reaction at cathode : Cr3+ (aq) + 3e-➜Cr (s)
Submit

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

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 76

Question # 1

What is difference between cation and anion ?

  • Ans 1: Cation: An atom or group of atoms having positive charge on it is called cation

    Example : like Na , k
  • Ans 2: Anion:An atom or group of atoms having negative charge on it is called cation

    Example : Cl , O etc
Submit

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

Question # 1

Name one solid, one liquid and one gaseous element present at room temperature?

  • Ans 1: Solid : Sodium, Iron Liquid: Bromine and Mercury Gas: Oxygen , Nitrogen, and Chlorine
Submit

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

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 79

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 80

Question # 1

Considering the electronic configuration of nitrogen atom, how many electrons are involved in bond formation and w hat type of covalent bond is formed?

  • Ans 1: Electronic configuration of N is 1s2.2s2.2p3 Nitrogen has 5 electrons in its valence shell. Three electrons are involved in bond formation and triple covalent bond is formed.: N = N :
Submit

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

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 82

Question # 1

Write down the chemical formulas of the following
(a) Sugar (b) Sulphuric acid

  • Ans 1: (a) Sugar : C12H22O11
  • Ans 2: (b) Sulphuric acid : H2SO4
Submit

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

Question # 1

Write names of any two noble metals

  • Ans 1: 1: Copper
  • Ans 2: 2: Mercury
  • Ans 3: 3: Silver
  • Ans 4: 4: Gold
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 84

Question # 1

Give chemical reaction between Methane (CH4) and chlorine (Cl2) in presence of diffused light .

  • Ans 1:
    CH4 + Cl2 ➜ CH3Cl +HCL
    CH3Cl +Cl2 ➜ CH2Cl2+HCL
    CH2Cl2 + Cl2 ➜ CHCl2 +HCL
    CHCL3 + Cl2 ➜ CCl4 ➜ CCl4 +HCL
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 85

Question # 1

Write electronic configuration of Sulphur .

  • Ans 1: Electronic configuration of Sulphur :
  • Ans 2: 16S = 1S2 , 2S2 , 2P6 , 3S2 , 3P4
Submit

9th Class Chemistry English Medium Chapter 1 Preparation - Set 86

Question # 1

Write electronic configuration of Sulphur .

  • Ans 1: Electronic configuration of Sulphur :
  • Ans 2: 16S = 1S2 , 2S2 , 2P6 , 3S2 , 3P4
Submit

ic-science-white
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.

Start Unit 1 Preparation

Is this page helpful?