MCQ
Acetylene can be prepared from
- APotassium fumarate
- BCalcium carbide
- CEthylene bromide
- ✓All of these
$\begin{array}{*{20}{l}}
{CH} \\
{|\,|\,|} \\
{\underbrace {CH}_{Anode}}
\end{array} + 2\,C{O_2} + 2\,KOH + \underbrace {{H_2}}_{{\text{Cathode}}}$
$Ca{C_2} + 2\,{H_2}O \to Ca{\left( {OH} \right)_2} + CH \equiv CH$
$\,\mathop {\mathop {C{H_2}}\limits_{|\,\,\,\,\,\,\,\,\,} }\limits_{Br\,\,\,\,\,} - \mathop {C{H_2}}\limits_{\mathop {|\,\,\,\,\,\,\,\,\,}\limits_{Br\,\,\,\,} } + 2\,KOH \to CH \equiv CH + 2\,KBr + 2\,{H_2}O$
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$\mathrm{HF}, \mathrm{H}_2, \mathrm{H}_2 \mathrm{~S}, \mathrm{CO}_2, \mathrm{NH}_3, \mathrm{BF}_3, \mathrm{CH}_4, \mathrm{CHCl}_3, \mathrm{SiF}_4$, $\mathrm{H}_2 \mathrm{O}, \mathrm{BeF}_2$
$(I)$ they exhibit high enthalpies of atomisation as the $d-$ subshell is full
$(II)$ $zn$ and $Cd$ do not show variable oxidation states while $Hg$ shows $+ I$ and $+ II$
$(III)$ Compound of $Zn,\,Cd$ and $Hg$, are paramagnetic in nature
$(IV)$ $Zn,\,Cd$ and $Hg$ are called soft metals