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Question:

When 0.1 mol MnO2 is oxidised, the quantity of electricity required to completely oxidise MnO2 to MnO4- is:

2×96500 C

9650 C

96500 C

96.50 C

Solution:

The oxidation reaction is as shown below.
MnO2 + e- → MnO4-
Oxidation of one mole of MnO2 requires 1 mole of electrons.
Hence, the oxidation of 0.1 mole of electrons will require 0.1 mole of electrons.
This corresponds to 96500 × 0.1 = 9650 C.