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Reducing Properties of Ammonia

Which of the ...

Question

Which of the following compounds do not give ammonia on reaction with water?

{M g}_{3} N_{2}

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A l N

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C a C N_{2}

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C a {(C N)}_{2}

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Solution

The correct option is D $C a {(C N)}_{2}$
$Let's see, what happens:$
$when the given, compounds react with water$
${M g}_{2} N_{2} + 6 H_{2} O ⟶ 2 M g (O H)_{2} + 2 {N H}_{3}$
$A l N + 3 H_{2} O ⟶ {N H}_{3} + A l (O H)_{3}$
$\begin{matrix} C a (C N)_{2} + 2 H_{2} O ⟶ C a (O H)_{2} + 2 H C N {C a C N}_{2} + 3 H_{2} O ⟶ {C a C O}_{3} + 2 {N H}_{3} \end{matrix}$

$\begin{matrix} Herce, only C a (C N)_{2} doesn't give {N H}_{3}, on reaction with water. So, option(D) is correct. \end{matrix}$

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