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Question: Which nitrate will decompose to give \(NO_{2}\)on heating?...

Which nitrate will decompose to give NO2NO_{2}on heating?

A

NaNO3NaNO_{3}

B

KNO3KNO_{3}

C

RbNO3RbNO_{3}

D

LiNO3LiNO_{3}

Answer

LiNO3LiNO_{3}

Explanation

Solution

: Only LiNO3LiNO_{3} gives NO2NO_{2} on heating. All other nitrites give oxygen.

4LiNO3→Δ2Li2O+4NO2+O24LiNO_{3}\overset{\quad\Delta\quad}{\rightarrow}2Li_{2}O + 4NO_{2} + O_{2}

2NaNO3→Δ2NaNO2+O22NaNO_{3}\overset{\quad\Delta\quad}{\rightarrow}2NaNO_{2} + O_{2}