Question

Statement 1: Permanganate titrations is not carried out in presence of hydrochloric acid.
Statement 2: Hydrochloric acid is oxidised to chlorine.

• A. If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation o f the statement 1.
• B. If both Statement 1 and Statement 2 are true but statement 2 is not the correct explanation o f the statement 1.
• C. If Statement 1 is true but Statement 2 is false.
• D. If Statement 1 is false but Statement 2 is true

Answer 1

Answer: (A)

Permanganate titrations are not carried out in presence of $HCl$ because it may oxidise some of the $HCl$ to $Cl_2$ gas according to the following chemical reaction; $2MnO^{-}_4 + 16H^{+} + 10Cl^{-}\to 2Mn^{2+} + 8H_2O + 5Cl_2.$ Hence we do not get the correct end point for the given titration.