Which of the following statements is not correct?

Options

A. Potassium permanganate is a powerful oxidising substance.
B. Potassium permanganate is a weaker oxidising agent than potassium dichromate.
C. Potassium permanganate is a stronger oxidising agent than potassium dichromate.
D. Potassium di chromate oxidises a secondary alcohol into a ketone

Answer

B

Explanation

(b) `MnO_(4)^(-) + 8H(+) +5_(e)^(-) rarr Mn^(2+) +4H_2O Cr_2O_(7)^(2-) +14H^(+) +6e^(-) rarr 2Cr^(3+) + 7H_2O`.As the gain of eletrons per mole is more in case of `Cr_2O_(7)^(2-)` then `MnO_4` hence it is stronger oxidising than `MnO_(4)^(-)`