MCQ Questions | Class 9 Science Chapter 3 | Atoms and Molecules with Answers

MCQ | Atoms and Molecules Class 9 | Part-4

Check the below NCERT MCQ Questions for Class 9 Science Chapter 3 Atoms and Molecules with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Atoms and Molecules Class 9 Science MCQs Questions with Answers to help students understand the concept very well.

Objective Question | NCERT Science Class 9

NCERT Solutions Class 9 Science
Book:	National Council of Educational Research and Training (NCERT)
Board:	Central Board of Secondary Education (CBSE)
Class:	9th
Subject:	Science
Chapter:	3 ( Part-4 )
Chapters Name:	Atoms and Molecules
Medium:	English

Ncert Solutions for Class 9 Science | Objective Type Questions

You can refer to NCERT Solutions for Class 9 Science Chapter 3 Atoms and Molecules to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Atoms and Molecules | Class 9 Science | NCERT Solutions

Q1.	Valency of Calcium element is:
	A.4
	B.5
	C.2
	D.3

Ans: 2

Q2.	The mass of 0.5 moles of Water molecules is:(Atomic mass, H =1; O = 16)
	A. 27 g
	B. 0.5 g
	C. 9 g
	D. 18 g

Ans: 9 g

Q3.	Who stated the Law of conservation of mass?
	A. Thomson
	B. Lavoisier
	C. Dalton
	D. Cavendish

Ans: Lavoisier

Q4.	Which constituent of air is monoatomic?
	A. Argon
	B. Water vapour
	C. Oxygen
	D. Nitrogen

Ans: Argon

Q5.	Compounds which are made up of two different elements called………………… compounds
	A.Elemental
	B.Molecular
	C.Polyatomic
	D.Binary

Ans: Binary

Q6.	…………… is not binary compound
	A.Hydrogen chloride
	B.Hydrogen sulphide
	C.Magnesium chloride
	D.None of the above

Ans: None of the above

Q7.	………… is a cationic species in magnesium chloride
	A.Mg
	B.Mg⁺¹
	C.Cl-
	D.Mg⁺²

Ans: Mg⁺²

Q8.	Formula of Aluminium oxide
	A.AlO
	B.AlO₂
	C.Al₂O₃
	D.Al₃O₂

Ans: Al₂O₃

Q9.	Name of that compound NaNO₃
	A.Sodium nitrogen oxide
	B.Sodium nitroxide
	C.Sodium nitrite
	D.Sodium nitrate

Ans: Sodium nitrate

Q10.	Calculate the molecular mass of Ozone
	A.16
	B.48
	C.98
	D.52

Ans: 48

Q11.	Calculate the molecular weight of carbon dioxide
	A.16
	B.32
	C.44
	D.40

Ans: 44

Q12.	Neutron present in……………..
	A.Atom
	B.Nucleus of atom
	C.Periphery of atom
	D.Not exist in atom

Ans: Nucleus of atom

Q13.	1 gross means…………….nos
	A.12
	B.122
	C.24
	D.144

Ans: 144

Q14.	4 moles of element having atomic mass 4 so find the amount of element in gram?
	A.8
	B.12
	C.16
	D.20

Ans: 16

Q15.	Atomic number of calcium
	A.5
	B.18
	C.20
	D.22

Ans: 20

Q16.	NA is symbol of……………….
	A.Atomic mass
	B.Atomic unit
	C.Avogadro number
	D.Einstein number

Ans: Avogadro number

Q17.	1 mole is ………………………..
	A.6.022 * 1022
	B.6.022 * 1023
	C.6.028 * 1022
	D.6.028 * 1023

Ans: 6.022 * 1023

Q18.	…………………..No. of protons present in nitrogen
	A.6
	B.14
	C.7
	D.20

Ans: 7

Q19.	Number of neutron present in oxygen molecule
	A.8
	B.5
	C.4
	D.6

Ans: 8

Q20.	Calculate the molecular weight of Cl₂
	A.35
	B.34
	C.70
	D.68

Ans: 70

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