Why `PbCl_4` good oxidising agent?

What is oxidising agent?

Why Sm^(2+) , Eu^(2+) and Yb^(2+) in solutions 'are good reducing agents but an aqueous solution of Ce^(4+) is a good oxidising agent?

Explain why (a) '(Ce4+' is a good oxidistng agent whereas '(Sm2+ is a good reducing agent b) '(La)(OH)_(3)' is stronger base than '(Lu)(OH)_(3)'

Give reason for the following: Halogen act as good oxidising agent.

Cr_(2)O_(7)^(2-) is a strong oxidising agent whereas MoO_(3) and WO_(3) are not oxidising agents. Why?

Which is a stronger oxidising agent Cr^2+orFe^(2+) Why?