set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The number of elements in the third period of periodic table is

a) 8

b) 18

c) 2

d) 32

Question : 2

Which of the following is an actinide?

a) Polonium

b) Promethium

c) Plutonium

d) Palladium

Question : 3

Consider the following statements :

1. 22gm. of $CO_2$ consist of 1 mole.
2. Number of molecules in 4 gm of oxygen is $10^22$.
3. Mass of 1 mole of a substance is called its formula mass.

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Question : 4

Elements of which group form anions most readily?

a) Nitrogen family

b) Halogens

c) Oxygen family

d) Alkali metals

Question : 5

A radioactive element X emits an α-particle followed by 2 β-particles in the successive steps as :
X $⟶↖{λ_1} ↙{-α particle} Y ⟶↖{λ_2} ↙{-2β particles} Z$
Which of the following statement(s) is/are correct?

1. Y and Z are isotopes
2. The atomic number of X and Z are the same
3. Y and Z are isobars
4. The mass number of Y is greater than X

a) 1 and 4

b) 2 and 3

c) Only 1

d) Only 3

Question : 6

Amongst the following statements, which are correct?

1. The ceaseless zig-zag motion of sol particles is due to the unbalanced bombardment of particles by the molecules of dispersion medium
2. The intensity of zig-zag motion increases with the increase in the size of the particles
3. The zig-zag motion of particles becomes intense at high temperature
4. This motion has a stirring effect which does not permit the particles to settle

a) 1, 2 and 4

b) 1, 2 and 3

c) 1, 3 and 4

d) 2, 3 and 4