The salt used for performing bead test in qualitative inorganic analysis is:

K_{2} S O_{4} . A l_{2} (S_{4})_{3} .24 H_{2} O

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F e S O_{4} (N H_{4})_{2} S O_{6} .6 H_{2} O

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

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C a S O_{4} .2 H_{2} O

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Solution

The correct option is A $N a (N H_{4}) H P O_{4} .4 H_{2} O$
Microcosmic salt, $N a (N H_{4}) H P O_{4} \cdot 4 H_{2} O$ is used for performing bead test in inorganic qualitative analysis for the detection of coloured ions.

Hence option (C) is correct.

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