1.

Conc. \[HN{{O}_{3}}\] is added before proceeding to test for group III members. This is to [NCERT 1974]

A. Oxidise any remaining \[{{H}_{2}}S\]
B. Convert ferrous ion into ferric ion
C. Form nitrates which give granular ppts
D. Increase ionisation of ammonium hydroxide
Answer» C. Form nitrates which give granular ppts


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