When a small amount of \(\mathrm{KMnO_4}\) is added to concentrated \(\mathrm{H_2SO_4}\), a green oily compound is obtained which is highly explosive in nature. Compound may be :
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- \(\mathrm{MnSO_4}\)
- \(\mathrm{Mn_2O_7}\)
- \(\mathrm{MnO_2}\)
- \(\mathrm{Mn_2O_3}\)
The Correct Option is B
Solution and Explanation
\(\mathrm{Mn_2O_7}\) (manganese heptoxide, the anhydride of \(\mathrm{HMnO_4}\)) is a dark green oily liquid, which is highly explosive and decomposes to \(\mathrm{MnO_2}\) and \(\mathrm{O_2}\).
\(\mathrm{MnSO_4}\) is a pale pink solid, \(\mathrm{MnO_2}\) is a black solid and \(\mathrm{Mn_2O_3}\) is a brown-black solid, so none of them is a green explosive oil.
Answer: (2) \(\mathrm{Mn_2O_7}\)
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