Which of the following would not proceed in the forward direction spontaneously?

1. ${\mathrm{Si}}^{+}+\mathrm{Cl}\to \mathrm{Si}+{\mathrm{Cl}}^{+}$

2. $\mathrm{F}+{\mathrm{I}}^{-}\to {\mathrm{F}}^{-}+\mathrm{I}$

3. Both

4. None

Increasing order of ionic radii and decreasing order of number of protons of the given isoelectronic species is:-

1. Ca⁺², K⁺, Cl^-, S^-2

2. Cl^-, Ca⁺², K⁺, S^-2

3. S^-2, Cl^-, Ca⁺², K⁺

4. None of the above

The electronic configuration of Palladium is:

1. [Kr] 5f³ 6d¹ 7s²

2. [Kr] 5f⁵ 6d¹ 7s²

3. [Kr] 5f² 6d¹ 7s²

4. None of the above.

Z_eff of Na⁺ and Na⁰ are respectively:

1. 1.95 and 1.22

2. 0.85 and 0.35

3. 1 and 0.35

4. 6.85 and 2.2

Removal of 2^nd electron is always:

1. Endothermic

2. Endothermic for Mg, Be, N

3. Exothermic for Mg, Be, N, and noble gases

4. Depends of electronic configuration

Atomic radius of Be, O, C, N, B are respectively (in pm) :-

(1) 111, 66, 77, 74, 88

(2) 74, 84, 111, 77,66

(3) 111, 88, 77, 74, 66

(4) 111, 66, 88, 77,74

The first four IP values of an element are 19, 190, 2000 and 2600 eV/atom. Element belongs to:-

(1) Amphoteric elements

(2) Four electron donor group

(3) s-block

(4) All of the above

The jump between the \(5^{th}\) and \(6^{th}\) ionization energies is large, suggesting the element has how many protons in its nucleus?

If atomic number of an element of He-family is Z then which of the following atomic number will highest EA?

(1) Z - 2

(2) Z - 1

(3) Z + 1

(4) Z + 2