NCERT Class 9 MCQ Quiz Hub

1. The chemical symbol for nitrogen gas is
Ni
N2
N+
N

2. The chemical symbol for sodium is
So
Sd
NA
Na

3. Which of the following would weigh the highest?
0.2 mole of sucrose (C12H22O11)
2 moles of CO2
2 moles of CaCO3
10 moles of H2O

4. Which of the following has maximum number of atoms?
18 g of H2O
18 g of O2
18 g of CO2
18 g of CO4

5. Which of the following correctly represents 360 g of water? (i) 2 moles of H2O (ii) 20 moles of water (iii) 6.022 × 1023 molecules of water (iv) 1.2044 × 1025 molecules of water
(i)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)

6. 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are
6.68 × 1023
6.09 × 1022
6.022 × 1023
6.022 × 102321

7. A change in the physical state can be brought about
only when energy is given to the system
only when energy is taken out from the system
when energy is either given to, or taken out from the system
without any energy change

8. The relative molecular mass of Na2S2O3.5H2O is
250 amu
250 g
248 amu
248 g

9. Which of the following has maximum number of atom?
18 g H2O
18 g of O2
18 g of CO2
18 g of CH4

10. Percentage of calcium in calcium carbonate is
40
30
48
36

11. Which has maximum number of molecules?
1 g of CO2
1 g of N2
1 g of H2
1 g of CH4

12. What mass of carbon dioxide (CO2) will contain 3.011 × 1023 molecules?
11.0 g
22.0 g
4.4 g
44.0 g

13. The value of Avogadro’s constant is:
6.0 × 1024
6.01 × 1022
6.022 × 1023
6.022 × 10-23

14. How many times an atom of sulphur is heavier than an atom of carbon?
32 times
12 times
8/3 times
12/32 times

15. The number of oxygen atoms in 4.4 g of CO2 is approx.
6 × 1022
6
12 × 1023
1.2 × 1023

16. Which of the following represents 12 u?
Mass of 1 hydrogen atom
Mass of C-12 atom
Mass of 0-16 atom
1/12th of mass of C-12 atom.

17. The molecule having an atomicity of 4 is:
Sulphate molecule
Ozone molecule
Phosphorus molecule
Methane molecule