- A${K_2}\left[ {PtC{l_6}} \right]$
- ✓$\left[ {Co{{\left( {N{H_3}} \right)}_3}{{(N{O_2})}_3}} \right]$
- C${K_4}\left[ {Fe{{\left( {CN} \right)}_6}} \right]$
- D$\left[ {Cu{{\left( {N{H_3}} \right)}_4}} \right]S{O_4}$
$\left[ Co \left( NH _{3}\right)_{3}\left( NO _{2}\right)_{3}\right]=$ out of the coordination sphere no ions (non ionisable) $K_{4}\left[F e(C N)_{6}\right]=5$ ions
$\left[ Co \left( NH _{3}\right)_{4}\right] . SO _{4}=2$ ions
More ions $\propto$ more conductivity
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$ArN _{2} Cl \overset{Cu / HCl}{\rightarrow} ArCl + N _{2}$ is known as

$\mathrm{Eu}, \mathrm{Cm}, \mathrm{Er}, \mathrm{Tb}, \mathrm{Yb}$ and $\mathrm{Lu}$
$C{{H}_{3}}COOEt+{{H}_{2}}O\xrightarrow{{{H}^{+}}}C{{H}_{3}}COOH+EtOH$
$Cr _{2} O _{7}^{2-}+14 H ^{+}+6 e ^{-} \rightarrow 2 Cr ^{3+}+7 H _{2} O$
The amount of $Cr ^{3+}$ obtained was $0.104\, g$. The
efficiency of the process(in\%) is
(Take : $F =96000\, C$, At. mass of chromium $=52$ )
