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(Atomic numbers $Ce =58, Gd =64$ and $Eu =63 .)$
$(a)$ $\left( NH _{4}\right)_{2}\left[ Ce \left( NO _{3}\right)_{6}\right]$
$(b)$ $Gd \left( NO _{3}\right)_{3}$ and
$(c)$ $Eu \left( NO _{3}\right)_{3}$
Answer is :
$\Delta U = 2.1\ kcal, \, \Delta S = 20\, cal\, K^{-1}$ at $300\, K$ Hence, $\Delta G$ is ............ $\mathrm{kcal}$
$(A)$ Ethane-$1\ 2$-diamine is a chelating ligand.
$(B)$ Metallic aluminium is produced by elecrtrolysis of aluminium oxide in presence of cryolite.
$(C)$ Cyanide ion is used as ligand for leaching of silver.
$(D)$ Phosphine act as a ligand in Wilkinson catalyst.
$(E)$ The stability constants of $\mathrm{Ca}^{2+}$ and $\mathrm{Mg}^{2+}$ are similar with $EDTA$ complexes.
Choose the correct answer from the options given below:
