MCQ
(image) $\xrightarrow[{\mathop {NaOH}\limits_{\left( {50\,\% } \right)} }]{{conc.}}{\text{Product}},$ Product


- ✓

- B

- C

- D







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(en-ethylenediamine; $H _{2} N - CH _{2}- CH _{2}- NH _{2}$ )
Reason : Oxidation state of $Cr$ in $Na_2CrO_4$ is $+VI$
$A$. They exhibit high enthalpy of atomization as the d-subshell is full.
$B$. $\mathrm{Zn}$ and $\mathrm{Cd}$ do not show variable oxidation state while $\mathrm{Hg}$ shows $+\mathrm{I}$ and + $II.$
$C$. Compounds of $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are paramagnetic in nature.
$D$. $\mathrm{Zn}, \mathrm{Cd}$ and $\mathrm{Hg}$ are called soft metals.
Choose the most appropriate from the options given below: