Ionic radii are :

(1) Inversely proportional to effective nuclear charge.

(2) Inversely proportional to square of effective nuclear charge.

(3) Directly proportional to effective nuclear charge.

(4) Directly proportional to square of effective nuclear charge.

The element with the electronic configuration \(1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^3 4 s^2\)belongs to:

1. V group

2. XV group

3. II group

4. III group

Which of the following oxide is amphoteric in nature?

1. SnO

2. ${\mathrm{SiO}}_2$

3. ${\mathrm{GeO}}_2$

4. ${\mathrm{CO}}_2$

In terms of increasing non-metallic character, which of the following is the
correct order for the elements N, P, O, and S?

1. P < S < N < O

2. O < S < N < P 

3. O < N < S < P 

4. N < S < O < P

The atomic species that has the maximum ionization energy is : 

One mole of magnesium in the vapour state absorbed 1200 kJ mol^-1 of energy.

If the first and second ionization energies of Mg are 750 and 1450 kJ mol^-1 respectively,

the final composition of the mixture is

1. 86% Mg⁺ + 14% Mg²⁺ 

2. 36% Mg⁺ + 64% Mg²⁺ 

3. 69% Mg⁺ + 31% Mg²⁺ 

4. 31% Mg⁺ + 69% Mg²⁺ 

How does electron affinity change when we move from left to right in a period in the
periodic table?

1. Generally increases

2. Generally decreases

3. Remains unchanged

4. First increases and then decreases

Which of the following elements will have the highest electronegativity?

1. Chlorine 

2. Nitrogen 

3. Cesium 

4. Fluorine

The group of elements in which the differentiating electron enters the anti penultimate
shell of atoms are called

1. p-block elements 

2. d-block elements

3. s-block elements 

4. f-block elements

Identify the INCORRECT match.