A) \[N{{H}_{3}}\]
B) \[BaC{{l}_{2}}\]
C) \[{{K}_{2}}Cr{{O}_{4}}\]
D) lift
Correct Answer: C
Solution :
Microcosmic salt on heating give \[NaP{{O}_{3}}\] which forms coloured beads with coloured cation. \[Na\,(N{{H}_{4}})HP{{O}_{4}}\xrightarrow{\Delta }NaP{{O}_{3}}+{{H}_{2}}O\uparrow +N{{H}_{3}}\uparrow \] \[NaP{{O}_{3}}+CuO\xrightarrow{\Delta }\underset{Blue\,bead}{\mathop{CuNaP{{O}_{4}}}}\,\]
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