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A colourless solid substance (A) on heat...

A colourless solid substance (A) on heating evolved `CO_2` and also gave a white residue, soluble in water. Residue also gave `CO_2` when treated with dilute HCI.

A

`Na_2CO_3`

B

`NaHCO_3`

C

`CaCO_3`

D

`Ca(HCO_3)_2`

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The correct Answer is:
B
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