Which of the following is the strongest oxidizing agent?

Sea is the greatest source of some halogens. Comment.

Gold dissolves in aqua regia forming:

The mixture of concentrated $HCl$ and $HNO_3$ made in $3:1$ ratio contains

Which of the following is the most active halogen?

Given below are two statements: Statement $(I)$: Oxidising power of halogens decreases in the order $F_2 > Cl_2 > Br_2 > I_2$,which is the basis of "Layer test". Statement $(II)$: "Layer test" to identify $Br_2$ and $I_2$ in aqueous solution involves the oxidation of bromide or iodide into $Br_2$ or $I_2$ respectively with $Cl_2$,which is a type of displacement redox reaction. In the light of the above statements,choose the correct answer from the options given below: