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JEE Main levelSingle correct optionDifficulty 2 of 3pn023

Which of the following statements about the gentle heating of ammonium salts is correct?

A $NH X_{4} NO X_{3}$ decomposes to give $N X_{2} O$ and water
B $NH X_{4} NO X_{2}$ decomposes to give $N X_{2} O$ and water
C $(NH X_{4}) X_{2} Cr X_{2} O X_{7}$ decomposes to give $NO X_{2}$ , $Cr X_{2} O X_{3}$ and water
D $NH X_{4} NO X_{3}$ decomposes to give $NO$ and ammonia

Answer: A

NH X_{4} NO X_{3} N X_{2} O + 2 H X_{2} O

on careful heating (laughing gas).

NH X_{4} NO X_{2} N X_{2} + 2 H X_{2} O

, not

N X_{2} O

, and

(NH X_{4}) X_{2} Cr X_{2} O X_{7} N X_{2} + Cr X_{2} O X_{3} + 4 H X_{2} O

. The fourth option is not a known decomposition.

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