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(D) When chlorine water is added to a solution containing iodide ions $(I^-)$,chlorine acts as an oxidizing agent and displaces iodine $(I_2)$ from th

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$I^-$ ion

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(D) When chlorine water is added to a solution containing iodide ions $(I^-)$,chlorine acts as an oxidizing agent and displaces iodine $(I_2)$ from the salt.$2I^- + Cl_2 	o 2Cl^- + I_2$The liberated iodine $(I_2)$ is non-polar and dissolves in the organic solvent chloroform $(CHCl_3)$,which forms a distinct layer. This iodine-chloroform solution exhibits a characteristic violet color.Therefore,the presence of a violet layer confirms the presence of $I^-$ ions.

$A$ salt solution is treated with chloroform drops. Then it is shaken with chlorine water. The chloroform layer becomes violet. The solution contains:

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