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Standard XII

Chemistry

Uses of Calcium Carbonate

A solid compo...

Question

A solid compound 'X' on heating gives $C O_{2}$ gas and a residue. The residue mixed with water forms 'Y'. On passing an excess of $C O_{2}$ through 'Y' in water, a clear solution 'Z' is obtained. On boiling 'Z', compound 'X' is reformed. The compound 'X' is :

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

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C a C O_{3}

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N a_{2} C O_{3}

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K_{2} C O_{3}

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Solution

The correct option is C $C a C O_{3}$
$C a C O_{3}$ on heating gives $C a O$ and $C O_{2}$
$C a C O_{3} + h e a t i n g \to C a O + C O_{2}$ .

X is $C a C O_{3}$ and residue is $C a O$ .
Residue CaO when mixed with water it forms:
$C a O + H 2 O \to C a (O H)_{2}$ .

Y is $C a (O H)_{2}$ .
On passing an excess of $C O_{2}$ through $C a (O H)_{2}$ (Y), it gives
$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$ .
On mild heating water will be evaporated, only $C a C O_{3}$ can be recovered.
Hence option B is correct.

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A solid compound 'X' on heating gives CO2 gas and a residue. The residue mixed with water forms 'Y'. On passing an excess of CO2 through 'Y' in water, a clear solution 'Z' is obtained. On boiling 'Z', compound 'X' is reformed. The compound 'X' is :

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