Question

Iodine is liberated on adding potassium iodide solution to a solution of:

• A. $ZnC{l}_2$
• B. $FeC{l}_3$
• C. $HgC{l}_2$
• D. $AlC{l}_3$

Answer 1

The correct option is B $FeC{l}_3$

Iron(III) chloride on reaction with potassium iodide produce iron(II) chloride, iodine and potassium chloride. This is a reversible reaction. This reaction takes place in the cold.

The reaction is as given below:

$2FeC{l}_3+2KI\to 2FeC{l}_2+I_2+KCl$

Hence, the correct option is (B).