QJEEM22Ched9e: JEE Main 2022 Chemistry - Class 11 JEEM22Ched9e Solution: Lithium nitrate and sodium nitrate, when heated separately,…

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Verified Solution • 2025–26 Session moderate

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

Accepted Answer

\mathrm{Li}_{2} \mathrm{O}, \mathrm{NaNO}_{2}

As per NCERT lithium nitrate when heated gives lithium oxide,

\mathrm{Li}_{2} \mathrm{O}

. Whereas other alkali metal nitrates decompose to give the corresponding nitrite.

4 \mathrm{LiNO}_{3} \longrightarrow 2 \mathrm{Li}_{2} \mathrm{O}+4 \mathrm{NO}_{2}+\mathrm{O}_{2}

2 \mathrm{NaNO}_{3} \longrightarrow 2 \mathrm{NaNO}_{2}+\mathrm{O}_{2}

However, the decomposition product of

\mathrm{NaNO}_{3}

is temperature dependent process as shown in the below reaction.

\mathrm{NaNO}_{3} \underset{500^{\circ} \mathrm{C}}{\stackrel{\Delta}{\longrightarrow}} \mathrm{NaNO}_{2}(\mathrm{~s})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g})

\Delta \downarrow, 800^{\circ} \mathrm{C}

\mathrm{Na}_{2} \mathrm{O}(\mathrm{s})+\mathrm{N}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})

As the temperature is not mentioned, we can go by the answer. (C)

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