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))_(2)SO_(4).6 " " H_(2)O)` & dichromate reacts in `6 : 1` molar ratio.