Multiple choice

The microcosmic salt among following is

  1. Na(NH3) HPO4. 6H2O

  2. Na.NH4 (HPO4) 4H2O

  3. Na(NH4) HPO4. 24H2O

  4. Na(NH4) HPO4. 12H2O
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B Correct answer
Explanation

Microcosmic salt is sodium ammonium hydrogen phosphate tetrahydrate, with the formula Na(NH₄)HPO₄·4H₂O. It crystallizes in characteristic tetrahedral shapes and is used in qualitative analysis for detecting cations through flame tests. The exact number of water molecules (4) is crucial for identification. This salt forms when equimolar solutions of sodium phosphate and ammonium phosphate are mixed.

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