Answer:
Sulphur reacts with sodium sulphite
to form water soluble sodium thiosulphate, also called hypo. Therefore, its
colour disappears.
\[\underset{\text{Sod}\text{.}\,\,\text{sulphate}}{\mathop{N{{a}_{2}}S{{O}_{3}}}}\,+S\xrightarrow{Heat}\,\underset{\text{Sodium}\,\,\text{thiosulphate}}{\mathop{N{{a}_{2}}{{S}_{2}}{{O}_{3}}}}\,\]
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