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

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MCQ Questions for Class 9 Science with Answers: Chemistry

Q1. 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

Q2. The radius of a hydrogen atom is:

(A) 10-2
(B) 10-4
(C) 10-9
(D) 10-10

Q3. Calculate the formula unit mass of ZnCl2?

(A) 137 u
(B) 124 u
(C) 123 u
(D) 111 u

Q4. Which of the following is correct pair of elements and its symbol?

(A) Silver – Si
(B) Sodium – So
(C) Potassium – Pt
(D) Sulphur – S

Q5. What is the formula mass unit of ZnO?

(A) 18 u
(B) 81 u
(C) 88 u
(D) 188 u

Q6. The chemical symbol for sodium is

(A) So
(B) Sd
(C) NA
(D) Na

Q7. Percentage of calcium in calcium carbonate is

(A) 40
(B) 30
(C) 48
(D) 36

Q8. 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

Q9. What is the mass of 0.5 mole of Hydrogen atom

(A) 2.0 g
(B) 1.5 g
(C) 1 g
(D) 0.5 g

Q10. The atomic mass of carbon is:

(A) 12
(B) 14
(C) 16
(D) 23

Q11. Who coined the term ‘Parmanu’ for the smallest indivisible particles?

(A) Leucippus
(B) L. Lavoisier
(C) Kanad
(D) None of them

Q12. How many moles are present in 40 g of He?

(A) 10 moles
(B) 11 moles
(C) 13 moles
(D) 12 moles

Q13. The atomic mass of sodium is 23. The number of moles in 46g of sodium is

(A) 4
(B) 2
(C) 0
(D) ½

Q14. Which of the following has maximum number of atoms?

(A) 18 g of H2O
(B) 18 g of O2
(C) 18 g of CO2
(D) 18 g of CO4

Q15. The word “mole” was introduced around 1896 by:

(A) Wilhelm Ostwald
(B) John Dalton
(C) Avogadro
(D) Vergilious

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