Which of the following will act as the best oxidizing agent?

Given below are two statements:
Assertion $(A)$: All $Cu$ $(II)$ halides are known except the iodide.
Reason $(R)$: $Cu^{2+}$ oxidizes $I^{-}$ to $I_2$.
The correct answer is:

Which is the most reactive metal among the given options?

Among $K, Ca, Fe,$ and $Zn$,the element which can form more than one binary compound with chlorine is

The highest Mn fluoride is $MnF_4$ whereas the highest oxide is $Mn_2O_7$,because . . . . . . .

Which of the following statements are correct?
$A$. The $M^{3+}/M^{2+}$ reduction potential for iron is greater than manganese.
$B$. The higher oxidation states of first row $d$-block elements get stabilized by oxide ion.
$C$. Aqueous solution of $Cr^{2+}$ can liberate hydrogen from dilute acid.
$D$. Magnetic moment of $V^{2+}$ is observed between $4.4-5.2 \ BM$.
Choose the correct answer from the options given below: