Given below are two statements: Statement I: Lithium and Magnesium do not form superoxide Statement II: The ionic radius of $\mathrm{Li}^{+}$ is larger than ionic radius of $\mathrm{Mg}^{2+}$ In the light of the above statements, choose the most appropriate answer from the options given below:

(C) Both Statement I and Statement II are correct

(A) Statement I is incorrect but Statement II is correct

(B) Statement I is correct but Statement II is incorrect

(D) Both Statement I and Statement II are incorrect

s-Block Elements — JEE Main · 2023 · 08 Apr 2023 · Shift 1 Question with Solution

Given below are two statements:
Statement I: Lithium and Magnesium do not form superoxide
Statement II: The ionic radius of

Li^{+}

is larger than ionic radius of

Mg^{2 +}

In the light of the above statements, choose the most appropriate answer from the options given below:

Answer: (C)

Statement I is correct: lithium and magnesium have small cations of high charge density that cannot stabilise the large, diffuse superoxide ion

O_{2}^{-}

, so they form only normal oxides such as

L i_{2} O

and

MgO

. Statement II is also correct: comparing the two cations,

L i^{+}

has a measured ionic radius of about

76 pm

, while

M g^{2 +}

, whose higher

+ 2

charge draws its electron cloud inward, is about

72 pm

, so

L i^{+}

is the larger ion. Both statements are correct.

JEE Main · 2023 · 08 Apr 2023 · Shift 1 · Single correct option