Question

In acidic medium, one mole of MnO4 accepts how many moles of
electrons in a redox process?
(A) 1
(B) 3
(C) 5
(D) 6​

Answer 1

Answer :-

• In acidic medium ,one mole of ${MnO_4}^-$ accepts 5 moles of electron in a redox process.

Explanation :-

In acidic medium , $Mn^{7+}\:of\:{MnO_4}^-$ is converted to $Mn^{2+}$ . Hence, the reaction that takes place is :-

$Mn^{7+}\:+\:{5e^-}\:\longrightarrow\:Mn^{2+}$

Therefore, 5 moles of electron is involved in this process.

Tricks for IIT-JEE

• For $KMnO_4$, there is a pneumonic to learn its n-factor in different medium,it is BAN - 153.

• Let us understand this pneumonic, B-Basic medium ,A-Acidic medium and N - neutral medium. Therefore, n factor of this compound in basic medium,acidic medium and neutral mefium is 1,5 and 3 respectively.