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Uses of Calcium Carbonate

A solid compo...

Question

A solid compound ‘X’ on heating gives $C O_{2}$ gas and a residue. The residue is then mixed with water to form ‘Y’. On passing an excess amount of $C O_{2}$ through ‘Y’ in water, a clear solution ‘Z’ is observed. On boiling ‘Z’, compound ‘X’ is formed. Compound ‘X’ is:

A

N a_{2} C O_{3}

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B

C a C O_{3}

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C

K_{2} C O_{3}

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D

C a (H C O_{3})_{2}

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Solution

The correct option is B $C a C O_{3}$
$C a C O_{3}$ on heating gives $C O_{2}$ gas and a residue, $C a O$ .
$C a C O_{3} Δ - \to C a O + C O_{2}$

When $C a O$ mixed with water, it forms $C a (O H)_{2}$ .
$C a O + H_{2} O \to C a (O H)_{2}$

On passing an excess of $C O_{2}$ through $C a (O H)_{2}$ in water, a clear solution sodium bicarbonate is observed.
$C a (O H)_{2} (l) + 2 C O_{2} (g) \to C a (H C O_{3})_{2} (l)$

On boiling $C a (H C O_{3})_{2}$ , compound $C a C O_{3}$ is formed.
$C a (H C O_{3})_{2} (l) Δ - \to C a C O_{3} (s) + C O_{2} (g) + H_{2} O) (l)$

Hence, compound ‘X’ is $C a C O_{3}$ .

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