Question

Find the oxidation number of element underlined in the species:

PbSO₄, U2O₇^4-, B₄O₇^2-, CrO₄^2-

Answer 1

S = +6 in PbSO₄

U = +5 in U₂O₇^4-

B = +3 in B₄O₇^2-

Cr = +6 in CrO₄^2-