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

Options

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

Answer

D

Explanation

`6Fe^(2+)(aq)+Cr_(2)O_(7)^(2-)(aq)+14H^(+)(aq)to2Cr^(3+)(aq)+6Fe^(3+)(aq)+7H_(2)O` 6 moles of Mohr.s salt are required per mole of `Cr_(2)O_(7)^(2-)`.