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

The skeletal ionic equation is,` Cr_2 O_(7)^(2-) + 14 H^(+) + 6 Fe^(2+) to 2Cr^(3+) + 6Fe^(3+) + 7H_2 O`
To reduce 1 mol of dichromate, 6 mol of `Fe^(2+)` is required.