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JEE Main 202229 JulyMorning Shift

Exam: JEE Main
Year: 2022
Date: 29 July
Shift: Morning Shift
Subject: Chemistry
Chapter: s Block Elements

JEE Main 2022 · 29 July · Morning Shift · Chemistry · s Block Elements

Lithium nitrate and sodium nitrate, when heated separately,...

Lithium nitrate and sodium nitrate, when heated separately, respectively, give

Lithium nitrate and sodium nitrate, when heated separately, respectively, give

Options

A ${LiNO}_{2}$ and ${NaNO}_{2}$
B ${Li}_{2}O$ and ${Na}_{2}O$
C ${Li}_{2}O$ and ${NaNO}_{2}$
D ${LiNO}_{2}$ and ${Na}_{2}O$

Correct answer

C. ${Li}_{2}O$ and ${NaNO}_{2}$

Step-by-step solution

Lithium nitrate when heated gives lithium oxide, ${Li}_{2}O$ , whereas other alkali metal nitrates decompose to give the corresponding nitrite.
$4{LiNO}_{3} ⟶ 2{Li}_{2}O + 4{NO}_{2} + {O}_{2}$
$2{NaNO}_{3} ⟶ 2{NaNO}_{2} + {O}_{2}$
However, the decomposition product of ${NaNO}_{3}$ are temperature dependent process as shown in the below reaction.

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