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+) + CrO_7^(2-) + 14H^(+) to 2Cr^(3+) + 6Fe^(3+) + 7H_2O`
`6` mol of `Fe^(2+)` are required per mol of `Cr_2O_7^(2-)`