Ceric ammonium sulphate and potassium permanganate are used as oxidising agents in acidic medium for oxidation of ferrous ammonium sulphate to ferric sulphate. The ratio of number of moles of ceric ammonium sulphate required per mole of ferrous ammonium sulphate to the number of moles of `KMnO_(4)` required per mole of ferrous ammonium sulphate is :

Options

A. `5.0`
B. `0.2`
C. `0.6`
D. `2.0`

Answer

A

Explanation

Oxidation of ferrous ammonium sulphate by `KMnO_(4)` is :
`2KMnO_(4)+8H_(2)SO_(4)+10 FeSO_(4).(NH_(4))_(2)SO_(4).6H_(2)O to `
`K_(2)SO_(4)+2MnSO_(4)+5Fe_(2)(SO_(4))_(3)+10(NH_(4))_(2)+SO_(4)+68H_(2)O`
`therefore 1 " mole of" FeSO_(4)(NH_(4))_(2)SO_(4).6H_(2)O " consumes " 1//5` mole of `KMnO_(4)`
`Fe^(2+)+Ce^(4+) to Fe^(3+)+Ce^(3+)`
Required ratio`=(1)/(1//5)=5.0`