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Uses of Slaked Lime

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.
Find out B

A

CaO

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B

C a C O_{3}

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C

C a_{3} N_{2}

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D

None of these

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Solution

The correct option is B $C a C O_{3}$
Ca burns in air to form CaO and $C a_{3} N_{2}$ .
$2 C a + O_{2} \to 2 C a O 3 C a + N_{2} \to C a_{3} N_{2}$
Calcium nitride on hydrolysis with $H_{2} O$ gives ammonia(A)
$C a_{3} N_{2} + 6 H_{2} O \to 3 C a (O H)_{2} + 2 N H_{3} (A)$
The alkaline solution of $C a (O H)_{2}$ thus formed reacts with $C O_{2}$ present in the air to form $C a C O_{3}$ (B).
$C a (O H)_{2} + C O_{2} \to C a C O_{3} (B) + H_{2} O$
Thus, $A = N H_{3} a n d B = C a C O_{3}$ (white powder)

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Similar questions

Q. 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.
Find out B

Q. 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. When

C O_{2}

gas passed into the alkaline solution, then which of the following product will be formed?

Q. 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 the produces a thin solid layer of

B

on the surface. Now that thin layer is peeled off and reacted with sulphuric acid and allowed to cool down and gain its water of hydration}. This compound is heated to

1000 K

to give a black coloured compound

X

along with an acidic gas (

Y

Y

in aqueous solution along with

H_{2} S

turn the solution yellow. Gas

A

Q. Calcium reacts with nitrogen gas to produce a white ionic solid, which on hydrolysis gives the gas (or gases):

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