The electronegativity values of elements X and Y are 2.1 and 3.0, respectively.
Calculate the percentage ionic character of the X–Y bond.

1.	20	2.	30
3.	17	4.	23

The correctly matched option is:-

1. ${\mathrm{Fe}}^{+3}>{\mathrm{Fe}}^{+2}$ $>$ ${\mathrm{Fe}}^{+}$  : Order of atomic radius 

2. O > C > B > N   : Order of ionisation energy 

3. ${\mathrm{O}}^{-2}$ $<{\mathrm{O}}^{-}$ $<\mathrm{O}$ $<{\mathrm{O}}^{+}$ :  Increasing order of Z_eff

4. O < N < F < Ne  :  Order of electron affinity

The group of metals having the positive value of electron gain enthalpy is:

Identify the incorrect match:

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

Which of the following elements will have the highest electronegativity?

1. Chlorine 

2. Nitrogen 

3. Cesium 

4. Fluorine

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

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⁺ 

Most basic oxide is

1. N₂O₃

2. N₂O₅

3. Bi₂O₅

4. Bi₂O₃

Which of largest in size?

1. Li⁺(aq)

2. Cs⁺(aq)

3. Li⁺(g)

4. Cs⁺(g)