NEETChemistryd and f Block Elements
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Permanganate oxidises iodide to iodate in neutral or faintly alkaline medium. Reason (R): In neutral or faintly alkaline medium, permanganate is reduced to manganate ion ( MnO₄²⁻ ). In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- A(A) is true but (R) is false.
- B(A) is false but (R) is true.
- CBoth (A) and (R) are true and (R) is the correct explanation of (A).
- DBoth (A) and (R) are true but (R) is not the correct explanation of (A).
Correct answer
A. (A) is true but (R) is false.
Step-by-step solution
Assertion (A) is true because in neutral or faintly alkaline medium, KMnO₄ oxidises iodide ( I^- ) to iodate ( IO₃^- ). Reason (R) is false because in neutral or faintly alkaline medium, permanganate ( MnO₄^- ) is reduced to manganese dioxide ( MnO₂ ), where the oxidation state of Mn is +4. Manganate ion ( MnO₄²⁻ ), where Mn is in +6 oxidation state, is formed when KMnO₄ is reduced in a strongly alkaline medium. Therefore, (A) is true but (R) is false. Answer: (A) is true but (R) is false.