JEE Main 201419 AprilOnline

Exam: JEE Main
Year: 2014
Date: 19 April
Mode: Online
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2014 · 19 April · Online · Chemistry · Classification of Elements and Periodicity in Properties

Which one of the following has largest ionic radius ?

Options

A ${F}^{-}$
B ${B}^{3 +}$
C ${O}^{2 -}$
D ${Li}^{+}$

Correct answer

C. ${O}^{2 -}$

Step-by-step solution

With increase in +ve charge, size of cation decreases.
With increase in -ve charge, size of anion increases.
Across the period, ionic size, decreases.
So correct order is

{B}^{3 +} < {Li}^{+} < {F}^{-} < {O}^{2 -}

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