Question

Cr2O7^2- + Hg → Hg^2+ + Cr^3+ (basic solution)

I got 14H2O + 2Cr2O7^2- + 3Hg → 3Hg^2+ + 2Cr^3+ 28OH-

but an answer key has something else and I can’t figure out how I’m wrong

Answer 1

the Cr your problem ( 2 Cr2) this is 4 Cr

Answer 2

........+ 4 Cr^3+28OH^-