On heating, $\mathrm{LiNO}_{3}$ gives how many compounds among the following? $\mathrm{Li}_{2} \mathrm{O}, \mathrm{N}_{2}, \mathrm{O}_{2}, \mathrm{LiNO}_{2}, \mathrm{NO}_{2}$

JEE Main · 2023 · 29 Jan 2023 · Shift 2 · s-Block Elements

On heating,

LiNO_{3}

gives how many compounds among the following?

Li_{2} O, N_{2}, O_{2}, LiNO_{2}, NO_{2}

Answer: 3

Solution

Because of its diagonal relationship with magnesium, lithium does not behave like the other alkali metals: its nitrate on heating decomposes in the manner of a group-2 nitrate, giving the oxide, nitrogen dioxide and oxygen,

4 LiNO X_{3} Δ 2 Li X_{2} O + 4 NO X_{2} + O X_{2}

. Of the species offered, the ones actually formed are lithium oxide, nitrogen dioxide and oxygen, a count of three.

JEE Main · 2023 · 29 Jan 2023 · Shift 2 · Integer answer

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