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JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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Analyzing +4 | -1
Assertion: Fe3O4\mathrm{Fe}_3 \mathrm{O}_4 contains iron atoms in two different oxidation numbers.

Reason: Fe2+\mathrm{Fe}^{2+} ions decolourize KMnO4\mathrm{KMnO}_4 solution.
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Correct option: B
Both assertion and reason are true but reason is not the correct explanation of assertion.
Option A (C2H5−{\mathrm{C}_2}\mathrm{H}_5^ -) is the strongest base because it is the conjugate base of the weakest acid (ethane).

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