Which of the following give no residue on heating ?

N H_{4} N O_{3}

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N H_{4} N O_{2}

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(N H_{4})_{2} C r_{2} O_{7}

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N H_{4} C l

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Solution

The correct option is D $N H_{4} C l$
$N H_{4} N O_{3} (g) Δ \to N_{2} O (g) + 2 H_{2} O (g) N H_{4} N O_{2} (s) Δ \to N_{2} (g) + 2 H_{2} O (g) (N H_{4})_{2} C r_{2} O_{7} (s) Δ \to N_{2} (g) + C r_{2} O_{3} (s) + 4 H_{2} O (g) N H_{4} C l (s) Δ \to N H_{3} (g) + H C l (g)$
Only on heating $(N H_{4})_{2} C r_{2} O_{7}$ , we get residue.

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