MCQ
Among $K{O_2},$ $NO_2^ - ,$ $Ba{O_2}$ and $NO_2^ + $ unpaired electron is present in
- A$NO_2^ + $ and $Ba{O_2}$
- B$K{O_2}$ and $Ba{O_2}$
- ✓$K{O_2}$ only
- D$Ba{O_2}$ only
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$[I]$ Only $A, B$ and $C$ react with $1\,M\,HCl$ to give $H_2\,(g)$
$[II]$ When $C$ is added to solutions of the other metal ions, metallic $B$ and $D$ are formed.
$[III]$ Metal $C$ does not reduce $A^{n+}$
$(A)$ Reduction of $HCHO$
$(B)$ Oxidation of $HCHO$
$(C)$ Reduction of $PhCHO$
$(D)$ Oxidation of $Ph-CHO$
