Question

Rank these species by their ability to act as an oxidizing agent. From best oxidizing agent to poorest oxidizing agent. Au3+, Mg2+, Zn2+, Cu+

Answer 1

the substances which itself ungoes reduction is called the oxidizing agent

now, Au3+ + 3e- -----------> Au ; E_cell = 1.4 V

Mg2+ + 2e- ------------> Mg ; E_cell = -2.36 V

Zn2+ + 2e- ---------> Zn ; E_cell = -0.76 V

Cu+ + e- -----------> Cu ; E_cell = 0.52

therefore, From best oxidizing agent to poorest oxidizing agent

Au3+ > Cu+ > Zn2+ > Mg2+