CBSE Class 9 Science Atoms and Molecules Quiz 2

1. Percentage of calcium in calcium carbonate is

A 40 B 30 C 48 D 36

2. Which has maximum number of molecules?

A 1 g of CO B 1 g of N C 1 g of H

3. What mass of carbon dioxide (CO₂) will contain 3.011 × 10²³ molecules?

A 11. 0 g B 22. 0 g C 4. 4 g D 44. 0 g

4. The value of Avogadro’s constant is:

A 6. 0 × 10 B 6. 01 × 10 C 6. 022 × 10 D 6. 022 × 10

5. 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

6. 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.

7. Which of the following would weigh the highest?

A 0. 2 mole of sucrose B 2 moles of CO C 2 moles of CaCO D 10 moles of H

8. The molecule having an atomicity of 4 is:

A Sulphate molecule B Ozone molecule C Phosphorus molecule D Methane molecule