Answer:
An aqueous solution of iodine is
violet in colour but it becomes colourless on adding excess of sodium hydroxide
because the products formed as a result of chemical reaction are colourless
\[2NaOH+{{I}_{2}}\,\xrightarrow{\,}\underbrace{\,NaI+NaIO}_{\text{(Colourless)}}+{{H}_{2}}O\]
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