MCQ
Turnbull's blue is
- AFerricyanide
- ✓Ferrous ferricyanide
- CFerrous cyanide
- DFerri-ferrocyanide
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$\mathop {C{H_3} - N{H_2}}\limits_{(P)} \,\,\,\,\,\,\,\,\,\,\,\mathop {Ph - N{H_2}}\limits_{(Q)} $