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  4. When chlorine water is added to an aqueous solution of sodium iodide in the presence of chloroform, a violet colouration is obtained. On adding more of chlorine water and vigorous shaking, the violet colour disappears. This shows the conversion of into

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Q. When chlorine water is added to an aqueous solution of sodium iodide in the presence of chloroform, a violet colouration is obtained. On adding more of chlorine water and vigorous shaking, the violet colour disappears. This shows the conversion of into

BITSATBITSAT 2019

Solution:

$Cl _{2}+2 NaI \rightarrow 2 NaCl + I _{2}$
$I _{2}$ gives violet colouration in $CHCl _{3}$.
$5 Cl _{2}+6 H _{2} O + I _{2} \rightarrow \underset{\text { Colourless }}{2 HIO _{3}}+10 HCl$
So, $I _{2}$ formed is converted to $HIO _{3}$.