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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb107

Heating which of the following nitrates leaves the metal oxide as residue, with evolution of nitrogen dioxide and oxygen?

A $LiNO X_{3}$
B $Mg (NO X_{3}) X_{2}$
C $Ba (NO X_{3}) X_{2}$
D $KNO X_{3}$

Answer: A, B, C

LiNO3, Mg(NO3)2 and Ba(NO3)2 decompose as

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

,

2 Mg (NO X_{3}) X_{2} 2 MgO + 4 NO X_{2} + O X_{2}

and

2 Ba (NO X_{3}) X_{2} 2 BaO + 4 NO X_{2} + O X_{2}

.

KNO X_{3}

stops at the nitrite:

2 KNO X_{3} 2 KNO X_{2} + O X_{2}

.

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