MCQ
Which of the following is correctly matched?
- A$[Cu(NH_3)_4]^{2+}$ Diamagnetic
- B$[Ni(CN)_4]^{2-}$ Para magnetic
- C$[MnCl_4]^{2-}$ Diamagnetic
- ✓$[Fe(CN)_6]^{4-}$ Diamagnetic
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$(I)\,\,K_H$ increases with increase in temperature generally.
$(II)\,\,K_H$ decreases with increase in temperature generally.
$(III)\,\, K_H$ is the characteristic constant of gas solvent system.

$\begin{array}{*{20}{c}}
{C{H_3}C{H_2} - N - C{H_2}C{H_3}} \\
{|\,} \\
{C{H_3}}
\end{array}$
is :
$(1)$ $Fe^{3+}$ 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