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Ammonia

Calcium burns...

Question

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas A and an alkaline solution.

The solution on exposure to air produces a thin solid layer of B on the surface. Compounds A and B are :

A

A is

N H_{3}

and B is

C a C O_{3}

.

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B

A is

N H_{3}

and B is

C a (O H)_{2}

.

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C

A is

C a C O_{3}

and B is

N H_{3}

.

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D

None of these.

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Solution

The correct option is C A is $N H_{3}$ and B is $C a C O_{3}$ .
Gas A is ammonia and Solid is calcium carbonate.

$3 C a + N_{2} \to C a_{3} N_{2}$

$C a_{3} N_{2} + 6 H_{2} O \to 3 C a (O H)_{2} + 2 N H_{3}$

$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$

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