A compound which is called microcosmic salt is:

N a_{2} H P O_{4} .2 H_{2} O

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N a H_{2} P O_{4} . H_{2} O

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N a (N H_{4}) H P O_{4} .4 H_{2} O

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N a_{2} (N H_{4}) P O_{4} .2 H_{2} O

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Solution

The correct option is C $N a (N H_{4}) H P O_{4} .4 H_{2} O$
$N a (N H_{4}) H P O_{4} \cdot 4 H_{2} O$ is called microcosmic salt. It is used to identify halides in qualitative analysis. It is formed as a byproduct of thermal decomposition of urine.

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