Q7 / 90 · JEE Main 2022 (29 Jul Shift 1) · Chemistry

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

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

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.

Hence, the correct answer is option: 'C'.

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