Question

List the incorrect statement out of the following:

• A. Iodometry involves direct reaction of $I_2$ solution with sodium thiosulphate solution.
• B. Starch is used as an indicator in iodometric titrations.
• C. Excess of KI is treated with an oxidising agent to liberate equivalent amounts of $I_2$.
• D. Sodium thiosulphate acts as a reducing agent in iodometry.

Answer 1

Answer: (A)

Iodometry involves direct reaction of $I_2$ solution with sodium thiosulphate solution.

Answer 2

In iodometry, iodine is first liberated from KI by the action of an oxidising agent which is then titrated with sodium thiosulphate solution.