JEE Main 2022 · 28 Jul · Shift 2 · Chemistry Q39

ChemistrySingle correct+4 / -1Question 39 of 90

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Permanganate titrations are not performed in presence of hydrochloric acid.

Reason R : Chlorine is formed as a consequence of oxidation of hydrochloric acid.

In the light of the above statements, choose the correct answer from the options given below

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is NOT the correct explanation of A

A is true but R is false

A is false but R is true

Answer and worked solution

Official answer: A

Both true. Permanganate oxidises HCl to $\mathrm{Cl_2}$ , which spoils the titration, and that is the reason.

(A)

Topics:Redox titrations Important compounds (KMnO4, K2Cr2O7)

JEE Main 2022 · 28 Jul · Shift 2, Chemistry question 39