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A substance ‘A’ on heating gives a Colou...

A substance ‘A’ on heating gives a Colourless gas. The residue is dissolved In water to form ‘B’. When excess of `co_2` in bubbled through a solution of ‘B’, ‘C’ is formed. ‘C’ on gently heating forms ‘A. Then the substance ‘A’ is

A

`1`. Calcium carbonate

B

`2`. Sodium carbonate

C

`3`. Calcium nitrate

D

`4`. Sodium bicarbonate

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