20 mL solution of 0.1 M ferrous suplhate was completely oxidised using a suitable oxidising agent what is the number of electronic exchanged ?

Options

A. `1.204 xx10^(22)`
B. `193`
C. `1930`
D. `1.204xx10^(21)`

Answer

D

Explanation

During oxidation of `FeSO_(4) Fe^(2+)` ions is oxidised in to `Fe^(3+)` ion
`Fe^(2+) rarr Fe^(3+) +e^(-)`
`therefore` Number of moles `=0.1 xx0.02 =0.02`
`because` in 1 moles `FeSO_(4)` number of molecules `=6.022 xx10^(23)`
number of electrones transfered `=1.204 xx10^(21)`