Among the following pairs (1) oxygen-sulfur (2) nitrogen-phosphorus (3) phosphorus arsenic (4) chlorine-iodine Those in which the first ionization energies differ by more than 300 kJ mole are:

Q55 · CSIR-NET Chemistry, December 2011

Paper: CSIR-NET December 2011 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy

Among the following pairs

\[ \begin{array}{ll} (1)\ \text{oxygen-sulfur} & (2)\ \text{nitrogen-phosphorus} \\ (3)\ \text{phosphorus arsenic} & (4)\ \text{chlorine-iodine} \end{array} \]

Those in which the first ionization energies differ by more than 300 kJ mole are:

(a)(1) and (3) only

(b)(1) and (2) only

(c)(2) and (3) only

(d)(3) and (4) only

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

First IEs (kJ mol⁻¹): O 1314/S 1000 (Δ = 314), N 1402/P 1012 (390), P 1012/As 947 (65), Cl 1251/I 1008 (243). Only pairs (1) and (2) differ by more than 300.

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