atomic structure molecules and nuclear chemistry - Category wise Question and Answer Practice Test with Solutions

Question : 11

The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard?

a) ¹²C₆

b) ¹⁶O₈

c) ¹H₁

d) ³⁵Cl₁₇

Question : 12

Which of the following pairs are isotopes?

a) Ice and steam

b) Nitric oxide and nitrogen dioxide

c) Oxygen and ozone

d) Hydrogen and deuterium

Question : 13 [NDA]

Which of the following pairs is/are correctly matched?

1. Isotopes : Atoms with same atomic number but different atomic mass
2. Isobars : Atoms with same number of neutrons but different atomic number
3. Isotones : Atoms with same mass number but different atomic number

a) 1 and 2 only

b) 1 only

c) 1, 2 and 3

d) 2 only

Question : 14

The cathode ray experiment was done for the first time by

a) John Dalton

b) Goldstein

c) J.J. Thomson

d) Rutherford

Question : 15 [CDS]

Which one of the following is heavy water used in nuclear reactor?

a) Water at 4°C but having molecular weight 19 u

b) Water having molecular weight 20 u

c) Water having molecular weight 18 u

d) Water below the ice in a frozen sea