Which of the following when treated with caustic soda or calcium hydroxide, decomposes to give ammonia?

(N H_{4})_{2} S O_{4}

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N H_{4} C l

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(a) and (b) above

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None of the above

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Solution

The correct option is C (a) and (b) above
Ammonium salts when treated with caustic soda or calcium hydroxide, decompose to give ammonia.
$(N H_{4})_{2} S O_{4} + 2 N a O H \to 2 N H_{3} + 2 H_{2} O + N a_{2} S O_{4}$
$2 N H_{4} C l + C a (O H)_{2} \to 2 N H_{3} + 2 H_{2} O + C a C l_{2}$

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