A) \[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}.24{{H}_{2}}O\]
B) \[FeS{{O}_{4}}.{{\left( N{{H}_{4}} \right)}_{2}}S{{O}_{4}}4{{H}_{2}}O\]
C) \[Na\left( N{{H}_{4}} \right)HP{{O}_{4}}.4{{H}_{2}}O\]
D) \[CaS{{O}_{4}}.2{{H}_{2}}O\]
Correct Answer: C
Solution :
[c] Microcosmic salt. \[Na\left( N{{H}_{4}} \right)HP{{O}_{4}}.4{{H}_{2}}O\] is used for bead test \[Na.\left( N{{H}_{4}} \right)HP{{O}_{4}}\to NaP{{O}_{3}}+N{{H}_{3}}+{{H}_{2}}O\] \[NaP{{O}_{3}}+CoO\to NaCo.P{{O}_{4}}\left( blue \right)\]
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