All oxidising agents

The most powerful oxidising agent is :

The most powerful oxidising agent is:

Statement -I: Fehling ' s reagent is a test for all aliphatic aldehydes. Statement-II : Aliphatic aldehydes can be easily oxidised even with mild oxidising agents.

Halogens are powerful oxidising agents because

The oxidising agent used to oxidise ferrous sulphate.

Which oxidising agent is used to oxidise ferrous sulphate.

What are oxidising agents?