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JEE Main 202125 JulyEvening Shift

Exam: JEE Main
Year: 2021
Date: 25 July
Shift: Evening Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2021 · 25 July · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

The ionic radii of F ^ - and O ^ 2 - respectively are 1 . 33 A and...

The ionic radii of ${F}^{-}$ and ${O}^{2 -}$ respectively are $1 . 33$ $A$ and $1 . 4A$ , while the covalent radius of $N$ is $0 . 74A$

The correct statement for the ionic radius of ${N}^{3 -}$ from the following is :

Options

AIt is smaller than ${F}^{-}$ and $N$
BIt is bigger than ${O}^{2 -}$ and ${F}^{-}$
CIt is bigger than ${F}^{-}$ and $N$ , but smaller than of ${O}^{2 -}$
DIt is smaller than ${O}^{2 -}$ and ${F}^{-}$ , but bigger than of
$N$

Correct answer

B. It is bigger than ${O}^{2 -}$ and ${F}^{-}$

Step-by-step solution

{F}^{-}, {O}^{2 -}

and

{N}^{3 -}

all are isoelectronic species in which

{N}^{3 -}

have least number of protons due to which it's size increases as least nuclear attraction
is experienced by the outer shell electrons. Size order

{N}^{3 -} > {O}^{2 -} > {F}^{-}

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