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

MCQ | Atoms and Molecules Class 9 | Part-3

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-3 )
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.	Which of the following pair of elements represents a mole ratio of 1:1?
	A. 20 g of sodium and 20 g of calcium
	B. 7 g of nitrogen and 12 gm of sodium
	C. 10 g of calcium and 6 g of carbon
	D. 14 g of nitrogen and 24 g of magnesium

Ans: 14 g of nitrogen and 24 g of magnesium

Q2.	Which of the following is the correct IUPAC symbol for the element Cobalt?
	A. Co
	B. Cb
	C. C
	D. none of these

Ans: Co

Q3.	Which of the following can be used to see atoms?
	A. Scanning tunneling microscope
	B. Microscope
	C. Most powerful microscope
	D. Optical microscope

Ans: Scanning tunneling microscope

Q4.	Which one of the following is the modern symbol of Gold?
	A. Gl
	B. Go
	C. Si
	D. Au

Ans: Au

Q5.	NaCl molecule is made of which of the following ions?
	A. Na cation and Cl anion
	B. Cl cation and Na anion
	C. Both Na and Cl cation
	D. Both Na and Cl anion

Ans: Na cation and Cl anion

Q6.	The number of atoms constituting a molecule is known as its……………
	A.Molecular weight
	B.Atomic number
	C.Atomicity
	D.Molecule

Ans: Atomicity

Q7.	Atomicity of argon…………
	A.Diatomic
	B.Atomic
	C.Polyatomic
	D.Monoatomic

Ans: Monoatomic

Q8.	Charged species is known as…………
	A.Electric current
	B.Anions
	C.Ions
	D.Current

Ans: Ions

Q9.	Negatively charged ions called…………..
	A.Electric current
	B.Anions
	C.Ions
	D.Current

Ans: Anions

Q10.	Positively charged ions called…………
	A.Ions
	B.Anions
	C.Cations
	D.Positron

Ans: Cations

Q11.	NaCl means?
	A.Sodium calcium
	B.Sodium chloride
	C.Nitrogen chloride
	D.Nitrogen calcium

Ans: Sodium chloride

Q12.	Choose correct a correct option
	A.Na+
	B.K-
	C.Cl+
	D.H-

Ans: Na+

Q13.	Which is the polyatomic ions from below option
	A.Hydrogen
	B.Oxygen
	C.Argon
	D.Ammonium

Ans: Ammonium

Q14.	Combining power of an element known as its………………….
	A.Valency
	B.Atomicity
	C.Molecularity
	D.None of the above

Ans: Valency

Q15.	Choose a correctly written molecule
	A.OH₂
	B.OC
	C.OCa
	D.Mg(OH)₂

Ans: Mg(OH)₂

Q16.	An atom has a mass number of 23 and atomic number 11. The number of protons are ________.
	A.11
	B.12
	C.23
	D.44

Ans: 11

Q17.	The balancing of chemical equation is based upon:
	A. Law of conservation of mass
	B. Law of multiple proportions
	C. Law of definite proportion
	D. Law of combining volumes

Ans: Law of conservation of mass

Q18.	The number of moles of oxygen atoms in two moles of nitric acid is:
	A.2
	B.4
	C.8
	D.6

Ans: 6

Q19.	During a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is known as
	A. Law of conservation of mass
	B. Law of multiple proportion
	C. Law of constant proportion
	D. None of these

Ans: Law of conservation of mass

Q20.	Who was the first to use the symbols for elements?
	A. Joseph L Proust
	B. Berzillius
	C. Antoine L Lavoisier
	D. Dalton

Ans: Dalton

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