Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is:

Options

A. `3`
B. `4`
C. `5`
D. `6`

Answer

D

Explanation

`6Fe^(2+)+Cr_(2)O_(7)^(2-)+14H^(+)rarr 6Fe^(3+)+2Cr^(3+)+7H_(2)O`
Mohr's salt `[FeSO_(4).(NH)_(4)SO_(4).6H_(2)O]`
and dichromate reacts in `6:1` molar ratio. So, no of moles of Mohr's salt `=6`