Find the incorrect match among the following electronic configurations and their corresponding period and group numbers.

1. [Ar] 3d⁵ 4s¹ → 4th period, 6th group
2. [Kr] 4d¹⁰ → 5th period, 12th group
3. [Rn] 6d² 7s² → 7th period, 3rd group
4. [Xe] 4f¹⁴ 5d² 6s² → 6th period, 4th group

 Which of the following orders is correct for the property mentioned in brackets?
 1.S²⁻ > Cl⁻ > K⁺ > Ca²⁺ (Ionisation energy)
 2. C < N < F < O (Second ionisation energy)
 3. B > Al > Ga > In > Tl (Electronegativity)
 4. Na⁺ > Li⁺ > Mg²⁺ > Be²⁺ > Al³⁺ (Ionic radius)

${\mathrm{IP}}_1$ and ${\mathrm{IP}}_2$ for Mg are 178 Kcal mol^–1 and 348 Kcal ${\mathrm{mol}}^{-1}$, respectively. The energy required for the reaction, $\mathrm{Mg}\to {\mathrm{Mg}}^{2+}$ $+$ $2{\mathrm{e}}^{-}$ will be:

1. +170 Kcal ${\mathrm{mol}}^{-1}$

2. +526 Kcal ${\mathrm{mol}}^{-1}$

3. –170 Kcal ${\mathrm{mol}}^{-1}$

4. –526 Kcal ${\mathrm{mol}}^{-1}$

Incorrect statement about characteristics regarding halogens is :

1. Ionization energy decreases with increase in atomic number.

2. Electronegativity decreases with increase in atomic number.

3. Electron affinity decreases with increase in atomic number.

4. Enthalpy of fusion increases with increase in atomic number. 

The process requiring the absorption of energy is :

1. $F\to F^{-}$

2. $H\to H^{-}$

3. $Cl\to C{l}^{-}$

4. $O\to O^{2-}$

Consider the following statements:

Choose the correct option from the given codes.

There are four elements 'p', 'q', 'r' and 's' having atomic number Z-1, Z, Z+1 and Z+2 respectively. If there element 'q' is an inert gas, select the correct answers from the following statements.

(i) 'p' has most negative electron gain enthalpy in the respective period.

(ii) 'r' is an alkali metal.

(iii) 's' exists in +2 oxidation state.

(1) (i) and (ii)                     

(2) (ii) and (iii)

(3) (i) and (iii)                     

(4) (i), (ii) and (iii)

Find the correct order of atomic/ionic sizes among the following:

(a) Al³⁺ < Mg²⁺ < Na⁺ < F⁻

(b) Al³⁺ < Mg²⁺ < Li⁺ < K⁺

(c) Fe⁴⁺ < Fe³⁺ < Fe²⁺ < Fe

(d) Mg > Al > Si > P

1. (a), (b) & (c)                       

2. (b), (c) & (d)

3. (a), (c)                          

4. (a), (b), (c) & (d)

Which of the following orders are correct for the ionization energies?

(A) \(  B a   <   S r   <   C a        \)                  
(B) \(S^{2 -} < S   < S^{2 +}\)
(C) \(C   <   O < N\)
(D) \(M g   <   A l   <   S i\)

1. A, B and D                             
2. A, C and D
3. A, B and C                             
4. A, B, C and D

The electron gain enthalpies of halogens in kJ mol^-1 are given below.

F =-332, Cl =-349, Br =-325, I =-295.

The lesser negative value for F as compared to that of Cl is due to: