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Which of the following is an INCORRECT statement about potassium permanganate (KMnO4) and potassium dichromate (K2Cr2O7)?

1. Both function as oxidising agents in acidic medium
2. Both are paramagnetic and exhibit colour
3. Molecular oxygen (O2) is used in the preparation of both compounds
4. The central metal atom of the oxo-anion in each compound has d³s hybridisation

Correct answer: Both are paramagnetic and exhibit colour

Solution

Both Mn in KMnO4 (+7, d⁰) and Cr in K2Cr2O7 (+6, d⁰) have no unpaired electrons, making both compounds diamagnetic, not paramagnetic. All other options are correct: both are strong oxidising agents in acid, O2 is involved in their industrial preparation, and the tetrahedral anions MnO4⁻ and Cr2O7²- involve sp³ (sometimes described as d³s) hybridisation.

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