Answer:
On passing \[{{H}_{2}}S\] gas
through a solution of \[S{{O}_{2}}\], oxidation of\[{{H}_{2}}S\] occurs. The
particles of sulphur that are formed get condensed to be in the colloidal
range. Therefore, the milky solution contains colloidal particles of sulphur.
\[2{{H}_{2}}S+S{{O}_{2}}\xrightarrow{\,}\,\underset{\text{(Colloidal)}}{\mathop{3S+2{{H}_{2}}O}}\,\]
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