Answer:
KI dissolves in water to give \[{{I}^{-}}\]
ions which are powerful reducing in nature. They reduce \[C{{u}^{2+}}\] ions to
\[C{{u}^{+}}\] ions and \[{{I}_{2}}\]is thus liberated.
\[2C{{u}^{2+}}+2{{I}^{-}}\,\xrightarrow{\,}\,2C{{u}^{+}}\,+{{I}_{2}}\]
But \[C{{l}^{-}}\] ions released
when \[HCl\] is dissolved in water are very weak reducing in nature and are not
in a position to reduce \[C{{u}^{2+}}\] ions to \[C{{u}^{+}}\] ions. Therefore,
chlorine is not liberated in this case.
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