How many of the following compounds liberate $N H_{3}$ on heating?

$(N H_{4})_{2} S O_{4}, (N H_{4})_{2} C O_{3}, N H_{4} C l, N H_{4} N O_{3}, (N H_{4})_{2} C r_{2} O_{7}, (N H_{4})_{2} C_{2} O_{4}$

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Solution

$2 (N H_{4})_{2} S O_{4} Δ - \to (N H_{4})_{2} S_{2} O_{7} + 2 N H_{3} + H_{2})$

$3 (N H_{4})_{2} S_{2} O_{7} Δ - \to 2 N H_{3} + 6 S O_{2} + 2 N_{2} + H_{2} O$

$(N H_{4})_{2} C O_{3} Δ - \to N H_{4} H C O_{3} + N H_{3}$

$N H_{4} C l Δ - \to N H_{3} + H C l$

$N H_{4} N O_{3} Δ - \to N_{2} O + 2 H_{2} O$

$(N H_{4})_{2} C r_{2} O_{7} Δ - \to N_{2} + C r_{2} O_{3} + 4 H_{2} O$

$(N H_{4})_{2} C_{2} O_{4} Δ - \to 2 N H_{3} + C O_{2} + C O + H_{2} O$

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