MCQ
The rate law for reaction $A + 2B = C + 2D$ will be
- ARate $ = K[A]\,[B]$
- BRate $ = K[A]\,[2B]$
- ✓Rate $ = K[A]\,{[B]^2}$
- DRate $ = K\frac{{[C]{{[D]}^2}}}{{[A]{{[B]}^2}}}$
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$(I)$ $MnSO_4.4H_2O$ $(II)$ $FeSO_4.7H_2O$
$(III)$ $NiSO_4.6H_2O$ $(IV)$ $CuSO_4.5H_2O$

$(1)$ $Fe^{3+}$ gives brown colour with potassium ferricyanide
$(2)$ $Fe^{2+}$ gives blue colour with potassium ferricyanide
$(3)$ $Fe^{3+}$ gives red colour with potassium thiocyanate
$(4)$ $Fe^{2+}$ gives brown colour with ammonium thiocyanate
The functional group present in $B$ and name of the reaction would be