Question

Which of the following set of ions act as oxidising agents? 

(1) \(Ce^{4+}\) and \(Tb^{4+ }\)

(2) \(La^{3+}\) and \(Lu^{3+ }\)

(3) \(Eu^{2+}\) and \(Yb^{2+ }\)

(4) \(Eu^{2+}\) and \(Tb^{4+}\)

Answer 1

Correct option is (1) \(Ce^{4+}\) and \(Tb^{4+ }\)

Most stable oxidation state of lanthanoids is +3

\(Ce ^{4+}\) and \(Tb ^{4+}\) will get reduced easily and will be good oxidising agents.