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Question

Chemistry Question on Group 13 Elements

Solubility of iodine in water may be increased by adding

A

Chloroform

B

Potassium iodide

C

Carbon disulphide

D

Sodium thiosulphate

Answer

Potassium iodide

Explanation

Solution

The solubility of I2I_2 in water increases by the addition of KI due to formation of polyhalide ion i.e.i.e. l3−KI+I2−>KI3{l^-_3 KI + I_2 -> KI_3} or I−+I2−>I3− {I^- + I_2 -> I^-_3}