Q46 · CSIR-NET Chemistry, December 2017

Paper: CSIR-NET December 2017 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy

The first ionization energy is the lowest for
(a)Br
(b)Se
(c)P
(d)As
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
IE₁ (kJ mol⁻¹): Se 941 < As 947 < P 1012 < Br 1140; Se is lowest because the paired 4p⁴ electron is easier to remove than the half-filled 4p³ of As.

Study loop for Main Group Elements

1. Practise the PYQsPrevious-year questions, with answers

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