On dry heating of the solid, which nitrate gives brown fumes of NO2 together with a metal oxide residue?

NEET levelSingle correct optionDifficulty 1 of 3qa113

On dry heating of the solid, which nitrate gives brown fumes of $NO X_{2}$ together with a metal oxide residue?

Heavy-metal nitrates decompose as

2 Pb (NO X_{3}) X_{2} 2 PbO + 4 NO X_{2} + O X_{2}

, giving brown

NO X_{2}

NaNO X_{3}

and

KNO X_{3}

only lose oxygen to give nitrites, and

NH X_{4} NO X_{3}

gives

N X_{2} O

and water. The answer is

Pb (NO X_{3}) X_{2}