This is a confusing one!

How many faradays are required to convert a mole of NO2- ions to NH4+ ions?
a. 4
b. 5
c. 6
d. 7
e. 8

1 answer

Write the equation and balance
NO2^- ==> NH4^+
electron change actually is all you need and oxidation state goes from +3 in NO2^- to -3 in NH4^+ for 6e change.
Therefore, it will take 1 faraday to convert 1/6 mole NO2^- to NH4^+. So it will take ______ F to convert 1 mole.