The pair of compounds which cannot exist together in solution is

N a H C O_{3}

and

N a O H

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N a H C O_{3}

and

H_{2} O

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N a H C O_{3}

and

N a_{2} C O_{3}

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N a_{2} C O_{3}

and

N a O H

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Solution

The correct option is A $N a H C O_{3}$ and $N a O H$
$N a H C O_{3}$ is an acidic salt which can react with $N a O H$ to give $N a_{2} C O_{3}$ . Hence they can't be found together.

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