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?

1. 15 proton in nucleus

2. 13 proton in nucleus

3. 11 proton in nucleus

4. Ionisation energy is not related to the number of protons in the 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

The element having very high electron affinity but zero ionisation enthalpy is:

1. He (due to inert gas configuration)

2. Be (due to fully filled subshell)

3. H (due to presence of allotropes)

4. None of the above

The pair of elements where the addition of a second electron to each atom is endothermic is:

1. N, Ne

2. Be, F

3. B, C

4. All of the above

The correct order in which the O-O bond

length increases in the following is

1. H₂O₂<O₂<O₃

2. O₃<H₂O₂<O₂

3. O₂<O₃<H₂O₂

4. O₂<H₂O₂<O₃

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

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

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.