Class 9 Science Chapter 3 Atoms and Molecules MCQ Questions with Answer

Class 9 MCQs

Atoms and Molecules Class 9 MCQ is one of the best strategies to prepare for the CBSE Class 9 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more Atoms and Molecules class 9 MCQ which will help them all through their board test.

Atoms and Molecules Class 9 MCQ Questions with Answer

Class 9 Science MCQ with answers are given here to Chapter 3 Atoms and Molecules. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 9 Science syllabus. By Solving these Class 9 MCQs, you will be able to analyze all of the concepts quickly in the Chapter and get ready for the Class 9 Annual exam.

Learn Atoms and Molecules Class 9 MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 9 Atoms and Molecules MCQ with answers given below.

Question 1 : The combining capacity of an element is called

(a) Valency

(b) Atomicity

(c) Atomic number

(d) Valence electrons

Click for Answer

A

Question 2 : Which is not represented by 1mole of Nitrogen gas?

(a) 6.023X1023 molecules of N2

(b) 12.046 X1023 atoms of N2

(c) 6.023X1023 atoms of N2

(d) 28g of N2

Click for Answer

C

Question 3 : If isotopic distribution of C-12 & C-14 is 98% and 2% respect(d)ely, then number of C-14 atoms in 12 g of C is:

(a) 1.244X1022

(b) 1.244X1023

(c) 3.88X1022

(d) 3.88X1022

Click for Answer

A

Question 4 : Identify the correct symbol of gold:

(a) Go

(b) Ge

(c) Gd

(d) Au

Click for Answer

D

Question 5 : The formula of Calcium phosphate is:

(a) CaPO4

(b) Ca(PO4)2

(c) Ca3(PO4)2

(d) Ca2(PO4)3

Click for Answer

C

Question 6 : Molecular weight of CuSO4.5H2O is equal to:

(a) 249.5

(b) 159.5

(c) 159.5 X90

(d) 159.5 +10 + 16

Click for Answer

A

Question 7 : How many moles of electrons weigh 1 kg. Mass of an electron is 9.1X10-31

(a) 6.022X1023

(b) 6.022X1023/9.1X10-31

(c) 1X1031/9.1

(d) 108/9.1X6.022

Click for Answer

D

Question 8 : 18g of water is electrolyse(d) The weight of oxygen obtained is:

(a) 16g
(b) 8g
(c) 4g
(d) 1g

Click for Answer

A

Question 9 : The balancing of chemical equations is in accordance with:

(a) Law of combining volumes

(b) Law of constant proportions

(c) Law of conservation of mass

(d) Both b and c

Click for Answer

D

Question 10 : Which of the following is a correct statement:

(a) Na2S is sodium sulphide, Na2SO3 is sodium sulphite, Na2SO4 is sodium sulphate

(b) Na2S is sodium sulphite, Na2SO3 is sodium sulphide, Na2SO4 is sodium sulphate

(c) Na2S is sodium sulphide, Na2SO3 is sodium sulphate, Na2SO4 is sodium sulphite

(d) Na2S is sodium sulphite, Na2SO3 is sodium sulphite, Na2SO4 is sodium sulphide

Click for Answer

A

Question 11 : 16g of S8 contains:

(a) 6.023×1023 Atoms of S

(b) 6.023×1023/8 atoms of s

(c) 6.023×1023/2 atoms of S

(d) 6.023×1023/16 atoms of S

Click for Answer

D

Question 12 : Which of the following has the smallest number of molecules?

(a) 0.1 moles of CO2

(b) 2g of H2 at STP

(c) 16g of O2 gas

(d) 3.4g of NH3

Click for Answer

A

Question 13 : Arrange the following in increasing number of molecules:

(a) 0.5moles of H2

(b) 4g of H2

(c) 18g of H2O

(d). 2.2g of CO2

(a) I <iii<(d)< ii

(b) Iv< i<iii<ii

(c) I<ii<iii<(d)

(d) Iv<iii<ii<i

Click for Answer

B

Question 14 : Out of 1 g of oxygen gas, 1 g of oxygen atoms and 1g of ozone , maximum number of atoms are present in:

(a) 1g of oxygen gas

(b) 1g of oxygen atoms

(c) 1 g of ozone

(d) All have equal number of atoms

Click for Answer

D

Question 15 : The number of atoms present in 0.5 moles of Nitrogen atoms is same as in:

(a) 12 g of C

(b) 24 g of Mg

(c) 8 g of O

(d) 32 g of S

Click for Answer

C

Question 16 : Which of the following is not a postulate of Dalton’s atomic theory:

(a) All matter is made up of atoms

(b) Atoms are tiny ind(d)isible and indestruct(d)e ultimate particles

(c) Atoms combine in small whole number ratios to form compounds

(d) Atoms of different elements can have the same mass

Click for Answer

D

Question 17 :

(a) 24g of Mg: 1 mole

(b) 35.5g of Cl2: _________

(a) 0.5mol

(b) 1 mol

(c) 2moles

(d) 2.5 moles

Click for Answer

A

Question 18 : An element X has valency equal to 3. What will be its formula with carbonate ions?

(a) X2CO3

(b) XCO3

(c) X2(CO3)3

(d) X(CO3)3

Click for Answer

C

Question 19 : The mass of a single atom of an element X is 2.65X 10-23g. The atomic mass and name of the element is:

(a) 16u, oxygen

(b) 16u, Sulphur

(c) 32u, oxygen

(d) 32u, Sulphur

Click for Answer

A

Question 20 :

(a) Oxygen: diatomic

(b) Ozone :_______

(a) Monoatomic

(b) Diatomic

(c) Triatomic

(d) Tetra atomic

Click for Answer

C

Question 21 : The word “mole” was introduced around 1896 by:           
(a) Wilhelm Ostwald
(b) John Dalton
(c) Avogadro
(d) Vergilious

Click for Answer

A

Question 22 : One gram of which of the following contains largest number of oxygen atoms?    
(a) O
(b) O2
(c) O3
(d) All contains same

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C

Question 23 : Percentage of calcium in calcium carbonate is          
(a) 40
(b) 30
(c) 48
(d) 36

Click for Answer

A

Question 24 : A change in the physical state can be brought about    
(a) only when energy is g(d)en to the system
(b) only when energy is taken out from the system
(c) when energy is either g(d)en to, or taken out from the system
(d) without any energy change

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C

Question 25 : An element X is tetravalent and another element Y is d(d)alent. The compound formed by these two elements will be:     
(a) XY
(b) XY2
(c) X2Y
(d) XY4

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B

Question 26 : Which of the following represents 12 u?         
(a) Mass of 1 hydrogen atom
(b) Mass of C-12 atom
(c) Mass of 0-16 atom
(d) 1/12th of mass of C-12 atom

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D

Question 27 : The chemical symbol for sodium is          
(a) So
(b) Sd
(c) NA
(d) Na

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D

Question 28 : Who laid the foundation of laws of Chemical Combination:        
(a) Democritus
(b) Lavoisier
(c) Dalton
(d) Proust

Click for Answer

B

Question 29 : The molecule having an atomicity of 4 is:     
(a) Sulphate molecule
(b) Ozone molecule
(c) Phosphorus molecule
(d) Methane molecule

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C

Question 30 : The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. The illustrate the law of:     
(a) Constant proportion
(b) Conservation of mass
(c) Multiple proportions
(d) Reciprocal proportions

Click for Answer

A

Question 31 : Which of the following is not a postulate of Daltons atomic theory:
(a) Atoms of different elements can have the same mass
(b) All matter is made up of atoms
(c) Atoms are tiny indivisible and indestructive ultimate particles
(d) Atoms combine in small whole number ratios to form compounds

Click for Answer

A

Question 32 : What is the formula mass unit of ZnO?          
(a) 18 u
(b) 81 u
(c) 88 u
(d) 188 u

Click for Answer

B

Question 33 : Formula for Aluminium Oxide is:        
(a) AlO
(b) AlO2
(c) Al3O2
(d) Al2O3

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D

Question 34 : How many molecules are present in one gram of hydrogen?    
(a) 6.02 × 1023
(b) 3.01 × 1023
(c) 2.5 × 1023
(d) 1.5 × 1023

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B

Question 35 : The correct symbol for silver is:           
(a) Ag
(b) S
(c) Ar
(d) AI

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A

Question 36 : 1 u or 1 amu means                 
(a) 1/12th mass of C-12 atoms
(b) Mass of C-12 atom
(c) Mass of O-16 atom
(d) Mass of Hydrogen molecule

Click for Answer

A

Question 37 : The number of atoms present in 0.5 moles of Nitrogen atoms is same as in:
(a) 12 g of C
(b) 8 g of O
(c) 24 g of Mg
(d) 32 g of S

Click for Answer

B

Question 38 : Out of 1 g of oxygen gas, 1 g of oxygen atoms and 1g of ozone , maximum number of atoms are present in:
(a) All have equal number of atoms
(b) 1g of oxygen gas
(c) 1g of oxygen atoms
(d) 1 g of ozone

Click for Answer

A

Question 39 : Arrange the following in increasing number of molecules:
i. 0.5moles of H
ii. 4g of H
iii. 18g of H2O

iv. 2.2g of CO
(a) iv < i < iii < ii
(b) i < iii < iv < ii
(c) iv < iii < ii < i
(d) i < ii < iii < iv

Click for Answer

A

Question 40 : a. 24g of Mg: 1 mole
              b. 35.5g of Cl2: _________

(a) 0.5mol
(b) 1 mol
(c) 2moles
(d) 2.5 moles

Click for Answer

A

Question 41 : a. Oxygen: diatomic
                  b. Ozone :_______

(a) Triatomic
(b) Monoatomic
(c) Diatomic
(d) Tetra atomic

Click for Answer

A

Question 42: The mass of a single atom of an element X is 2.65X 10-23g. The atomic mass and name of the element is:
(a) 16u, Sulphur
(b) 16u, oxygen
(c) 32u, oxygen
(d) 32u, Sulphur

Click for Answer

B

Question 43 : An element X has valency equal to 3. What will be its formula with carbonate ions?
(a) X2(CO3)3
(b) X2CO3
(c) XCO3
(d) X(CO3)

Click for Answer

A

Question 44 : Which of the following has the smallest number of molecules?
(a) 2g of H2 at STP
(b) 3.4g of NH3
(c) 0.1 moles of CO2
(d) 16g of O2 gas

Click for Answer

C

Question 45 : 16g of S8 contains:
(a) 6.023×1023/16 atoms of S
(b) 6.023×1023 Atoms of S
(c) 6.023×1023/8 atoms of s
(d) 6.023×1023/2 atoms of S

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A

Question 46 : 18g of water is electrolyse The weight of oxygen obtained is:
(a) 8g
(b) 16g
(c) 4g
(d) 1g

Click for Answer

B

Question 47 : Which is not represented by 1mole of Nitrogen gas?
(a) 6.023X1023 atoms of N2
(b) 6.023X1023 molecules of N2
(c) 12.046 X1023 atoms of N2
(d) 28g of N

Click for Answer

A

Question 48 : The combining capacity of an element is called
(a) Valency
(b) Atomicity
(c) Atomic number
(d) Valence electrons

Click for Answer

A

Question 49 : How many moles of electrons weigh 1 kg. Mass of an electron is 9.1X10-31
(a) 108/9.1X6.022
(b) 6.022X1023
(c) 6.022X1023/9.1X10-31
(d) 1X1031/9.1

Click for Answer

A

Question 50 : Molecular weight of CuSO4.5H2O is equal to:
(a) 159.5 X90
(c) 249.5
(b) 159.5
(d) 159.5 +10 + 16

Click for Answer

C

Question 51 : The formula of Calcium phosphate is:
(a) Ca3(PO4)2
(b) CaPO4
(c) Ca(PO4)2
(d) Ca2(PO4)

Click for Answer

A

Question 52: Which of the following is a correct statement:
(a) Na2S is sodium sulphide, Na2SO3 is sodium sulphite, Na2SO4 is sodium sulphate
(b) Na2S is sodium sulphite, Na2SO3 is sodium sulphide, Na2SO4 is sodium sulphate
(c)Na2S is sodium sulphide, Na2SO3 is sodium sulphate, Na2SO4 is sodium sulphite
(d) Na2S is sodium sulphite, Na2SO3 is sodium sulphite, Na2SO4 is sodium sulphide

Answer

A

Question 53 : The balancing of chemical equations is in accordance with:
(a) Both b and c
(b) Law of combining volumes
(c) Law of constant proportions
(d) Law of conservation of mass

Click for Answer

A

Question 54 : The most remarkable concept that Dalton’s atomic theory proposed was that of the:
(a) atomic weight
(b) atomic mass
(c) molar mass
(d) none of the above

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B

Question 55 : Who coined the term ‘Parmanu’ for the smallest indivisible particles?
(a) Leucippus
(b) L. Lavoisier
(c) Kanad
(d) None of them

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C

Question 56 : Identify the correct symbol of Gold.
(a) Go
(b) Gd
(c) Ge
(d) Au

Click for Answer

D

Question 57 : Identify the correct symbol of gold:
(a) Au
(b) Go
(c) Ge
(d) Gd

Click for Answer

A

Question 58 : If isotopic distribution of C-12 & C-14 is 98% and 2% respectively, then number of C-14 atoms in 12 g of C is:
(a) 1.244X1022
(b) 1.244X1023
(c) 3.88X1022
(d) 3.88X1022 

Click for Answer

A

Question 59 : Which of the following contains maximum number of molecules?
(a) 19 CO2
(b) 1 g N2
(c) 1 g H2
(d) 1 g CH

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C

Question 60 : The molecular formula of potassium nitrate is ________.
(a) KNO3
(b) KNO
(c) KNO2
(d) KON

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A

Question 61 : What is the latin name of sodium?
(a) Kalium
(b) Plumbum
(c) Natrium
(d) None of the above

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C

Question 62 : The combining capacity of an element is called
(a) Valency
(b) Atomicity
(c) Atomic number
(d) Valence electron

Click for Answer

A

Question 63 : Which of the following statements is not true about an atom?
(a) Atoms are not able to exist independently.
(b) Atoms are the basic units from which molecules and ions are formed.
(c) Atoms are always neutral in nature.
(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

Click for Answer

D

Question 64 : The law of definite proportions was given by:
(a) John Dalton
(b) Humphry davy
(c) Proust
(d) Michael Faraday

Click for Answer

C

Question 65 : The atomic mass of carbon is:
(a) 12
(b) 14
(c) 16
(d) 23

Click for Answer

A

Question 66: Who coined the term ‘Parmanu’ for the smallest indivisible particles?
(a) Leucippus
(b) L. Lavoisier
(c) Kanad
(d) None of them

Click for Answer

C

Question 67 : Which one of the following phrases would be incorrect to use?
(a) A mole of an element
(b) A mole of a compound
(c) An atom of an element
(d) An atom of a compound

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D

Question 68 : The chemical symbol for barium is:
(a) B
(b) Ba
(c) Be
(d) Bi

Click for Answer

B

Question 69 : The molecular formula of potassium nitrate is ________.
(a) KNO3
(b) KNO
(c) KNO2
(d) KO

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A

Question 70 : The chemical symbol for nitrogen gas is
(a) Ni
(b) N2
(c) N+
(d) N

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B

Question 71 : The molecule having an atomicity of 4 is:
(a) Sulphate molecule
(b) Ozone molecule
(c) Phosphorus molecule
(d) Methane molecule

Click for Answer

C

Question 72 : How many times an atom of sulphur is heavier than an atom of carbon?
(a) 32 times
(b) 12 times
(c) 8/3 times
(d) 12/32 times

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C

Question 73 . Which of the following represents a correct chemical formula?
(a) CaCl
(b) BiPO4
(c) NaSO4
(d) NaS

Click for Answer

B

Question 74 : Which of the following statements is not true about an atom?
(a) Atoms are not able to exist independently.
(b) Atoms are the basic units from which molecules and ions are forme(d)
(c) Atoms are always neutral in nature.
(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

Click for Answer

D

Question 75 : Percentage of calcium in calcium carbonate is
(a) 40
(b) 30
(c) 48
(d) 36

Click for Answer

A

Question 76 : The mass of sodium in 11.7 g of sodium chloride is:
(a) 2.3g
(b) 4.6g
(c) 6.9g
(d) 7.1g

Click for Answer

B

Question 77 . Which of the following correctly represents 360g of water?
(i) 2 moles of water
(ii) 20 moles of water
(iii) 6.022 × 1023 molecules of water
(iv) 1.2044 × 1025 molecules of water
(a) (i)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

Click for Answer

D

Question 78 . The molecular formula of potassium nitrate is ________.
(a) KNO3
(b) KNO
(c) KNO2
(d) KON

Click for Answer

A

Question 79 . Which of the following contains maximum number of molecules?
(a) 19 CO2
(b) 1 g N2
(c) 1 g H2
(d) 1 g CH4

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C

Question 80 . 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:
(a) 6.68 ×1023
(b) 6.09 ×1022
(c) 6.022 ×1023
(d) 6.022 ×1021

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A

Question 81 . What is the formula mass unit of ZnO?
(a) 18 u
(b) 81 u
(c) 88 u
(d) 188 u

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B

Question 82 : The number of molecules in 16.0g of oxygen is:
(a) 6.02 × 1023
(b) 6.02 ×10−23
(c) 3.01 × 10−23
(d) 3.01 × 10−23

Click for Answer

D

Question 83 : 4g of iodine and 14.2g of chlorine are made to react completely to yield a mixture of ICl and ICl3 . Calculate the ratio of moles of ICl and ICl3 :
(a) 1: 1
(b) 2: 1
(c) 3: 1
(d) 1: 2

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A

Question 84 : One gram of which of the following contains largest number of oxygen atoms?
(a) O
(b) O2
(c) O3
(d) All contains same

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C

Question 85 : The number of oxygen atoms in 4.4 g of CO2 is approx.
(a) 6 × 1022
(b) 6
(c) 12 × 1023
(d) 1.2 × 1023

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D

Question 86 : The molecule having an atomicity of 4 is:
(a) Sulphate molecule
(b) Ozone molecule
(c) Phosphorus molecule
(d) Methane molecule

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C

Question 87 : Choose the law of conservation of mass
(a) Mass neither be created nor formed
(b) Mass can neither be created nor reform
(c) Mass can neither be created nor destroyed
(d) Mass can neither be created nor alive

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C

Question 88 : Which of the following represents the correct relation between Avogadro’s number (No), number of particles (N) and moles (n)?
(a) n = N / No
(b) n = No / N
(c) n = N No
(d) all are correct

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A

Question 89 : When an atom loses electrons, it is called a (an) ______ and has a _____ charge.
(a) Anion, positive
(b) Cation, positive
(c) Anion, negative
(d) Cation, negative

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B

Question 90: Selenium ingested in the amount of 90 micrograms per day causes loss of hair. How many selenium atoms are in this size sample? (Atomic weight: Se = 78.96.)
(a) 6.9 × 1023
(b) 8.8 × 1017
(c) 8.8 × 1022
(d) 6.9 × 1017

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D

Question 91 : …………….. for some elements as proposed by Dalton.
(a) Shape
(b) Initiator
(c) Symbol
(d) Color

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C

Question 92 : The law of definite proportions was given by:
(a) John Dalton
(b) Humphry davy
(c) Proust
(d) Michael Faraday

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C

Question 93 : Atomic radius is measured in…………
(a) Kg
(b) cm
(c) Mm
(d) nm

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D

Question 94: The chemical symbol for barium is:
(a) B
(b) Ba
(c) Be
(d) Bi

Click for Answer

B

Question 95 :

a. Oxygen: diatomic

b. Ozone :_______

  • a) Tetra atomic
  • b) Monoatomic
  • c) Diatomic
  • d) Triatomic 
Click for Answer

D

Question 96: The mass of a single atom of an element X is 2.65X 10-23g. The atomic mass and name of the element is:

  • a) 16u, oxygen
  • b) 16u, Sulphur
  • c) 32u, oxygen
  • d) 32u, Sulphur
Click for Answer

A

Question 97: The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. The illustrate the law of:
(a) Constant proportion
(b) Conservation of mass
(c) Multiple proportions
(d) Reciprocal proportions

Click for Answer

A

Question 98: The number of atom in 4.25g of NH3 is approximately:
(a) 1×1023
(b) 2×1023
(c) 4×1023
(d) 6×1023

Click for Answer

D

Question 99: How many molecules are present in one gram of hydrogen?
(a) 6.02×1023
(b) 3.01×1023
(c) 2.5×1023
(d) 1.5×1023

Click for Answer

B

Question 100: Which of the following is not a postulate of Daltons atomic theory:

  • a) Atoms of different elements can have the same mass
  • b) All matter is made up of atoms
  • c) Atoms are tiny indivisible and indestructive ultimate particles
  • d) Atoms combine in small whole number ratios to form compounds
Click for Answer

A

Question 101: 

a. 24g of Mg: 1 mole

b. 35.5g of Cl2: _________

  • a) 0.5mol
  • b) 1 mol
  • c) 2moles
  • d) 2.5 moles
Click for Answer

A

Question 102 : Molecular weight of CuSO4.5H2O is equal to:

  • a) 249.5
  • b) 159.5
  • c) 159.5 X90
  • d) 159.5 +10 + 16
Click for Answer

A

Question 103: An element X has valency equal to 3. What will be its formula with carbonate ions?

  • a) X2(CO3)3
  • b) X2CO3
  • c) XCO3
  • d) X(CO3)3
Click for Answer

A

Question 103: Which of the following has the smallest number of molecules?

  • a) 2g of H2 at STP
  • b) 3.4g of NH3
  • c) 0.1 moles of CO
  • d) 16g of O2 gas
Click for Answer

C

Question 104: 16g of S8 contains:

  • a) 6.023×1023/8 atoms of s
  • b) 6.023×1023 Atoms of S
  • c) 6.023×1023/16 atoms of S 
  • d) 6.023×1023/2 atoms of S
Click for Answer

C

Question 105: The number of atoms present in 0.5 moles of Nitrogen atoms is same as in:

  • a) 8 g of O
  • b) 12 g of C
  • c) 24 g of Mg
  • d) 32 g of S
Click for Answer

A

Question 106: Out of 1 g of oxygen gas, 1 g of oxygen atoms and 1g of ozone , maximum number of atoms are present in:

  • a) 1g of oxygen atoms
  • b) 1g of oxygen gas
  • c) All have equal number of atoms 
  • d) 1 g of ozone
Click for Answer

A

Question 107: Arrange the following in increasing number of molecules:

i. 0.5moles of H2

ii. 4g of H2

iii. 18g of H2O

iv. 2.2g of CO2

  • a) iv < i < iii < ii
  • b) i < iii < iv < ii
  • c) iv < iii < ii < i
  • d) i < ii < iii < iv
Click for Answer

A

Question 108: How many moles of electrons weigh 1 kg. Mass of an electron is 9.1X10-31

  • a) 108/9.1X6.022
  • b) 6.022X1023
  • c) 6.022X1023/9.1X10-31
  • d) 1X1031/9.1
Click for Answer

A

Question 109: Identify the correct symbol of gold:

  • a) Au
  • b) Go
  • c) Ge
  • d) Gd
Click for Answer

A

Question 110: If isotopic distribution of C-12 & C-14 is 98% and 2% respectively, then number of C-14 atoms in 12 g of C is:

  • a) 1.244X1022
  • b) 1.244X1023
  • c) 3.88X1022
  • d) 3.88X1022
Click for Answer

A

Question 111: The formula of Calcium phosphate is:

  • a) Ca3(PO4)2
  • b) CaPO4
  • c) Ca(PO4)2
  • d) Ca2(PO4)3
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A

Question 112: Which of the following is a correct statement:

  • a) Na2S is sodium sulphide, Na2SO3 is sodium sulphite, Na2SO4 is sodium sulphate
  • b) Na2S is sodium sulphite, Na2SO3 is sodium sulphide, Na2SO4 is sodium sulphate
  • c) Na2S is sodium sulphide, Na2SO3 is sodium sulphate, Na2SO4 is sodium sulphite
  • d) Na2S is sodium sulphite, Na2SO3 is sodium sulphite, Na2SO4 is sodium sulphide
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A

Question 113: The balancing of chemical equations is in accordance with:

  • a) Both b and c
  • b) Law of combining volumes
  • c) Law of constant proportions
  • d) Law of conservation of mass
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A

Question 114: 18g of water is electrolyse The weight of oxygen obtained is:

  • a) 16g
  • b) 8g
  • c) 4g
  • d) 1g
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A

Question 115: Which is not represented by 1mole of Nitrogen gas?

  • a) 6.023X1023 atoms of N2
  • b) 6.023X1023 molecules of N2
  • c) 12.046 X1023 atoms of N2
  • d) 28g of N2
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A

Question 116: The combining capacity of an element is called

  • a) Valency
  • b) Atomicity
  • c) Atomic number
  • d) Valence electrons
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A

Question 117 . The law of definite proportions was given by:         
(a) John Dalton
(b) Humphry davy
(c) Proust
(d) Michael Faraday

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C

Question 118. The most remarkable concept that Dalton’s atomic theory proposed was that of the:    
(a) atomic weight
(b) atomic mass
(c) molar mass
(d) none of the above

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B

Question 119. Who coined the term ‘Parmanu’ for the smallest indivisible particles?          
(a) Leucippus
(b) L. Lavoisier
(c) Kanad
(d) None of them

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C

Question 120. Which of the following contains maximum number of molecules?            
(a) 19 CO
(b) 1 g N
(c) 1 g H
(d) 1 g CH4

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C

Question 121. The molecular formula of potassium nitrate is ________.         
(a) KNO3
(b) KNO
(c) KNO2
(d) KON

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A

Question 122. What is the latin name of sodium?       
(a) Kalium
(b) Plumbum
(c) Natrium
(d) None of the above

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C

Question 123. The combining capacity of an element is called      
(a) Valency
(b) Atomicity
(c) Atomic number
(d) Valence electron

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A

Question 124. Which of the following statements is not true about an atom?           
(a) Atoms are not able to exist independently.
(b) Atoms are the basic units from which molecules and ions are formed.
(c) Atoms are always neutral in nature.
(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

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D

Question 125. Who coined the term ‘Parmanu’ for the smallest indivisible particles?      
(a) Leucippus
(b) L. Lavoisier
(c) Kanad
(d) None of them

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C


Question 126. The mass of sodium in 11.7 g of sodium chloride is:     
(a) 2.3g
(b) 4.6g
(c) 6.9g
(d) 7.1g

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B

Question 127. Which of the following correctly represents 360g of water?
(i) 2 moles of water
(ii) 20 moles of water
(iii) 6.022 × 1023 molecules of water
(iv) 1.2044 × 1025 molecules of water
(a) (i)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

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D

Question 128. The molecular formula of potassium nitrate is ________.
(a) KNO3
(b) KNO
(c) KNO2
(d) KON

Click for Answer

A

Question 129. Identify the correct symbol of Gold.     
(a) Go
(b) Gd
(c) Ge
(d) Au

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D

Whoever needs to take the CBSE Class 9 Board Exam should look at this MCQ. To the Students who will show up in CBSE Class 9 Science Board Exams, It is suggested to practice more and more questions. Aside from the sample paper you more likely had solved. These Atoms and Molecules Class 9 MCQ are ready by the subject specialists themselves.

Question 130. Which one of the following phrases would be incorrect to use?      
(a) A mole of an element
(b) A mole of a compound
(c) An atom of an element
(d) An atom of a compound

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D

Question 131. The chemical symbol for barium is:       
(a) B
(b) Ba
(c) Be
(d) Bi

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B

Question 132. The molecular formula of potassium nitrate is ________.      
(a) KNO3
(b) KNO
(c) KNO2
(d) KO

Click for Answer

A

Question 133. The atomic mass of carbon is:       
(a) 12
(b) 14
(c) 16
(d) 23

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A

Question 134. Which of the following represents a correct chemical formula?
(a) CaCl
(b) BiPO4
(c) NaSO4
(d) NaS

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B

Question 135. Which of the following statements is not true about an atom?
(a) Atoms are not able to exist independently.
(b) Atoms are the basic units from which molecules and ions are forme(d)
(c) Atoms are always neutral in nature.
(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

Click for Answer

D

Question 136. Percentage of calcium in calcium carbonate is
(a) 40
(b) 30
(c) 48
(d) 36

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A

Question 137. The number of oxygen atoms in 4.4 g of CO2 is approx.
(a) 6 × 1022
(b) 6
(c) 12 × 1023
(d) 1.2 × 1023

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D

Question 138. Which of the following contains maximum number of molecules?
(a) 19 CO2
(b) 1 g N2
(c) 1 g H2
(d) 1 g CH4

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C

Question 139 . 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:
(a) 6.68 ×1023
(b) 6.09 ×1022
(c) 6.022 ×1023
(d) 6.022 ×1021

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A

Question 140. What is the formula mass unit of ZnO?
(a) 18 u
(b) 81 u
(c) 88 u
(d) 188 u

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B

Question 141. The chemical symbol for nitrogen gas is
(a) Ni
(b) N2
(c) N+
(d) N

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B

Question 142. The molecule having an atomicity of 4 is:
(a) Sulphate molecule
(b) Ozone molecule
(c) Phosphorus molecule
(d) Methane molecule

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C

Question 143. How many times an atom of sulphur is heavier than an atom of carbon?
(a) 32 times
(b) 12 times
(c) 8/3 times
(d) 12/32 times

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C

Question 144. Atomic radius is measured in…………
(a) Kg
(b) cm
(c) Mm
(d) nm

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D

Question 145. The chemical symbol for barium is:
(a) B
(b) Ba
(c) Be
(d) Bi

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B

Question 146 . Which of the following represents the correct relation between Avogadro’s number (No), number of particles (N) and moles (n)?
(a) n = N / No
(b) n = No / N
(c) n = N No
(d) all are correct

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A

Question 147. When an atom loses electrons, it is called a (an) ______ and has a _____ charge.
(a) Anion, positive
(b) Cation, positive
(c) Anion, negative
(d) Cation, negative

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B

Question 148. The molecule having an atomicity of 4 is:
(a) Sulphate molecule
(b) Ozone molecule
(c) Phosphorus molecule
(d) Methane molecule

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C

Question 149 . Choose the law of conservation of mass
(a) Mass neither be created nor formed
(b) Mass can neither be created nor reform
(c) Mass can neither be created nor destroyed
(d) Mass can neither be created nor alive

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C

Question 150. Selenium ingested in the amount of 90 micrograms per day causes loss of hair. How many selenium atoms are in this size sample? (Atomic weight: Se = 78.96.)
(a)  6.9 × 1023
(b) 8.8 × 1017
(c) 8.8 × 1022
(d) 6.9 × 1017

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D

Question 151. …………….. for some elements as proposed by Dalton.
(a) Shape
(b) Initiator
(c) Symbol
(d) Color

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C

Question 152. The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. The illustrate the law of:
(a) Constant proportion
(b) Conservation of mass
(c) Multiple proportions
(d) Reciprocal proportions

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A

Question 153. The number of atom in 4.25g of NH3 is approximately:
(a)  1×1023
(b) 2×1023
(c) 4×1023
(d) 6×1023

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D

Question 154. How many molecules are present in one gram of hydrogen?
(a) 6.02×1023
(b) 3.01×1023
(c) 2.5×1023
(d) 1.5×1023

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B

Question 155. The number of molecules in 16.0g of oxygen is:
(a)  6.02 × 1023
(b) 6.02 ×10−23
(c) 3.01 × 10−23
(d) 3.01 × 1023

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D

Question 156.4g of iodine and 14.2g of chlorine are made to react completely to yield a mixture of ICl and ICl3 . Calculate the ratio of moles of ICl and ICl3 :
(a) 1: 1
(b) 2: 1
(c) 3: 1
(d) 1: 2

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A

Question 157. One gram of which of the following contains largest number of oxygen atoms?
(a) O
(b) O2
(c) O3
(d) All contains same

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C

Question 158. The law of definite proportions was given by:
(a) John Dalton
(b) Humphry davy
(c) Proust
(d) Michael Faraday

Click for Answer

C

You can easily get good marks If you study with the help of Class 9 Atoms and Molecules MCQ. We trust that information provided is useful for you. NCERT MCQ Questions for Class 9 Atoms and Molecules PDF Free Download would without a doubt create positive results. 

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Frequently Asked Question (FAQs)

How many MCQ questions are there in Class 9 Chapter 3 Science?

In Class 9 Chapter 3 Science, we have provided 158 Important MCQ Questions, But in the future, we will add more MCQs so that you can get good marks in the Class 9 exam.

Can we score good marks in Class 9 Science with the help of Atoms and Molecules MCQ Questions?

Yes, MCQ Question is one of the best strategies to make your preparation better for the CBSE Board Exam. It also helps to know the student’s basic understanding of each Chapter. So, You can score good marks in the Class 9 Science exam.

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