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AIPMT PRELIMS2007Chemistry-Periodic Properties

AIPMT PRELIMS 2007 Chemistry Proton Affinity MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Which one of the following ionic species has the greatest proton affinity to form stable compound?

A

NH2−\text{NH}_2^-

B

F−\text{F}^-

C

I−\text{I}^-

D

HS−\text{HS}^-

Correct Answer

Option A

Detailed Explanation

Proton affinity is influenced by atomic size and electronegativity. Across a period, increased nuclear charge reduces proton affinity. Down a group, increased atomic size reduces proton affinity.

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