MCQ
A gas which exists in three allotropic forms $\alpha , \beta$ and $\gamma$ is
- ✓$SO_2$
- B$SO_3$
- C$CO_2$
- D$NH_3$
Anode $\left\{\begin{array}{c}2 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{H}_{2} \mathrm{S}_{2} \mathrm{O}_{8}+2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \\ 2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{O}_{2}+4 \mathrm{H}^{+}+4 \mathrm{e}^{-}\end{array}\right\}$
Cathode $\left\{2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2}+2 \mathrm{OH}^{-}-2 \mathrm{e}^{-}\right\} \times 3$
Net: $2 \mathrm{H}_{2} \mathrm{SO}_{4}+8 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{S}_{2} \mathrm{O}_{8}+\mathrm{O}_{2}+3 \mathrm{H}_{2}+6 \mathrm{H}^{+}+6 \mathrm{OH}^{-}$
Hence ratio of $\mathrm{n}_{\mathrm{O}_{2}}$ and $\mathrm{n}_{\mathrm{H}_{2}}$ is $1: 3 .$
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$(P)\, Fe(CO)_5\,\,\, (Q)\,CO\,\,\, (R)\, H_3B \leftarrow CO\,\,\,(S)\, [Mn(CO)_5]^-$
$\mathrm{H}_2, \mathrm{He}_2^{+}, \mathrm{O}_2^{+}, \mathrm{N}_2^{2-}, \mathrm{O}_2^{2-}, \mathrm{F}_2, \mathrm{Ne}_2^{+}, \mathrm{B}_2$