The reaction of sulphur in alkaline medium is given below:
$\mathrm{S}_{8(\mathrm{~s})}+\mathrm{aOH}_{(\mathrm{aq})}^{-} \longrightarrow \mathrm{bS}_{(\mathrm{aq})}^{2-}+\mathrm{CS}_{2} \mathrm{O}_{3}^{2-}(\mathrm{aq})+\mathrm{dH}_{2} \mathrm{O}_{(\ell)}$
The values of 'a' is
(12)
$\mathrm{S}_{8}+\mathrm{aOH}^{-} \longrightarrow \mathrm{bs}^{-2}+\mathrm{CdS}_{2} \mathrm{O}_{3}^{-2}+\mathrm{dH}_{2} \mathrm{O}$
$\mathrm{S}_{8}+\mathrm{bOH}^{-} \longrightarrow 4 \mathrm{~S}^{-2}+2 \mathrm{~S}_{2} \mathrm{O}_{3}^{-2}+\mathrm{dH}_{2} \mathrm{O}$
$\mathrm{S}_{8}+12 \mathrm{OH}^{-} \longrightarrow 4 \mathrm{~S}^{-2}+2 \mathrm{~S}_{2} \mathrm{O}_{3}^{-2}+6 \mathrm{H}_{2} \mathrm{O}$
$a=12$
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