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Adding a little KMnO4 to concentrated H2SO4 produces a highly explosive green oily liquid. This compound is:

1. Mn2O3
2. MnSO4
3. Mn2O7
4. MnO2

Correct answer: Mn2O7

Solution

Concentrated sulphuric acid dehydrates KMnO4 to manganese heptoxide, Mn2O7, a green oily explosive liquid.

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