Statement 1: Potassium permanganate is not suitable as a primary standard substance for redox titrations.

Statement 2: A substance that decomposes or reacts with air or water at room temperature cannot serve as a primary standard substance.

Question

Statement 1: Potassium permanganate is not suitable as a primary standard substance for redox titrations.

Statement 2: A substance that decomposes or reacts with air or water at room temperature cannot serve as a primary standard substance.

TestHub · Accepted Answer

Solid KMnO4 is not suitable as a primary standard substance. It can decompose or react with reducing impurities, so its purity is unreliable. A KMnO4 solution can still be used as a redox titrant after standardization. Both revised statements are true, and Statement 2 explains Statement 1.

Final Answer is A.

Chemistry - Redox Reactions Question with Solution | TestHub

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