$N a_{2} C O_{3}$ and $N a H C O_{3}$ may be distinguished by treating their aqueous solutions with:

dil. Acetic acid

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M g O

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Phenolphthalein

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None

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Solution

The correct option is C Phenolphthalein
The phenolphthalein indicator can be used to distinguish aqueous solutions of sodium carbonate and sodium bicarbonate. The aqueous solution of sodium bicarbonate containing phenolphthalein indicator is colurless whereas the aqueous solution of sodium carbonate containing phenolphthalein indicator is pink in colour.

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N a_{2} C O_{3}

N a H C O_{3}

N a H C O_{3}

C O_{2}

H C l O_{4}, H N O_{3}

H C l

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