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+)(aq) + Cr_3O_7^(2-) (aq) + 14H^(+) (aq) to 2Cr^(3+)(aq) + 6Fe^(3+)(aq) + 7H_2O`
no. of moles of `Fe^(2+)` (mohr.s salt) required per mole of `Cr_2O_7^(2-)` = 6