JEE Main 2022 · 28 Jun · Shift 1 · Chemistry Q87

ChemistryInteger+4 / -1Question 87 of 90

The quantity of electricity in Faraday needed to reduce 1 mol of $\mathrm{Cr_2O_7^{2-}}$ to $\mathrm{Cr^{3+}}$ is ______

Your answer

Answer and worked solution

Official answer: 6

Electrons. Two Cr each go from +6 to +3: 6 mol of electrons, i.e. 6 F.

Answer: 6

JEE Main 2022 · 28 Jun · Shift 1, Chemistry question 87