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Redox Reactions

Which of the ...

Question

Which of the following changes occurs when excess of $C O_{2}$ gas is passed into a clear solution of lime water ?

A

A white precipitate containing both

C a C O_{3}

and

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

is formed

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B

Initially a white precipitate of

C a C O_{3}

is formed which changes into soluble

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

on passing excess

C O_{2}

gas

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C

A white precipitate of

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

is formed

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D

A white precipitate of

C a C O_{3}

is formed

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Solution

The correct option is C Initially a white precipitate of $C a C O_{3}$ is formed which changes into soluble $C a (H C O_{3})_{2}$ on passing excess $C O_{2}$ gas
Carbon dioxide passed into limewater gives a milky solution. This is due to the insoluble suspension of calcium carbonate formed: $C a (O H_{2} + C O 2 \to C a C O_{3} + H_{2} O$
If excess CO2 is added, the following reaction takes place:
$C a C O_{3} + H_{2} O + C O_{2} \to C a (H C O_{3})_{2}$
Hence option B is correct.

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