Online test of Chapter 3 Atoms and Molecules 1 Science| Class 9th

Questions:

1. The formula of a chloride of a metal M is MCl3, the formula of the phosphate of metal M will be
(a) MPO4
(b) M2PO4
(c) M3PO4
(d) M2(PO4)3

2. The ratio of H:O by mass in hydrogen peroxide (H2O2) is
(a) 16 : 1
(b) 1 : 8
(c) 1 : 32
(d) 1 : 16

3. Which has the largest number of molecules?
(a) 54 g of N2O5
(b) 28 g of CO2
(c) 36 g of H2O
(d) 46 g of C2H5OH

4. The molecular formula of zinc phosphate is
(a) Zn(PO4)3
(b) Zn2PO4
(c) Zn3(PO4)2
(d) ZnPO4

5. The accepted unit of atomic mass and molecular mass is
(a) amu
(b) g
(c) kg
(d) g mol-1

6. Valence of noble gases is
(a) 1
(b) 0
(c) 2
(d) none of these

7. The number of atoms of hydrogen present In 1 mole of ethyne (C2H2) is
(a) 4 x 6.023 x 1023
(b) 2 x 6.023 x 1023
(c) 6.023 x 1023
(d) 8 x 6.023 x 1023

8. The law of definite proportions was proposed by
(a) John Dalton
(b) Richter
(c) Joseph Proust
(d) A. Lavoisier

9. The reference standard used for defining atomic mass unit is
(a) H
(b) C-12
(c) C-13
(d) C-14

10. The element whose gram-atomic mass and gram-molecular mass are the same is
(a) argon.
(b) nitrogen.
(c) oxygen.
(d) hydrogen.

Chapter 3 Atoms and Molecules Quiz 1| Class 9th

Click on ‘Start Quiz’ to Take Test.