Question

The compound AgF2 is an unstable compound. However, if formed, the compound acts as a very strong oxidizing agent. Why?

Answer 1

The oxidation state of $Ag$ in $AgF_2$ is $+2$.
But, $+2$ is an unstable oxidation state of $Ag$.
Therefore, whenever $AgF_2$ is formed, silver readily accepts an electron to form $Ag ^+$ .
This helps to bring the oxidation state of $Ag$ down from $+2$ to a more stable state of $+1$.

As a result, $AgF_2$ acts as a very strong oxidizing agent.