MCQ
Formalin is an aqueous solution of
- AFormic acid
- ✓Formaldehyde
- CFluorescein
- DFurfuraldehyde
It is used as biological preservative.
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${E^0}_{cell} = 0.79\;V$
$E_{C{r_2}O_7^{2 - }}^0 = 1.33\;V,\;{E^0}_{{I_2}}$ is ........... $\mathrm{V}$
$(a)$ $HCHO$ $(b)$ $C_6H_5-CHO$
$(c)$ $\begin{array}{*{20}{c}}
{\,\,C{H_3}} \\
{\,|\,\,\,\,\,} \\
{C{H_3} - C - CHO} \\
{|\,\,\,} \\
{\,\,C{H_3}\,}
\end{array}$ $(d)$ $Ph-CH_2-CHO$