JEE Mains · Chemistry · STD 12 - 4. d and f- block elements

Given below are two statements: Statement \(I :\) Potassium permanganate on heating at \(573\, K\) forms potassium manganate. Statement \(II :\) Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature. In the light of the above statements, choose the most appropriate answer from the options given below

A Statement \(I\) is true but statement \(II\) is false
B Both statement \(I\) and statement \(II\) are true
C Statement \(I\) is false but statement \(II\) is true
D Both statement \(I\) and statement \(II\) are false

Verified Solution

Answer & Solution

Correct Answer

(A) Statement \(I\) is true but statement \(II\) is false

Step-by-step Solution

Detailed explanation

\(2 KMnO _{4} \stackrel{573 K }{\longrightarrow} K _{2} MnO _{4}+ MnO _{2}+ O _{2}\) Potassium Potassium permanganate \(\quad\) manganate Statement\(-I\) is correct. Statement\(-II\) is incorrect

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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