MCQ
In a molecule of phosphorus $(V)$ oxide, there are
- A$4P-P, 10P-O$ and $4P=O$ bonds
- ✓$12P-O$ and $4P=O$ bonds
- C$2P-O$ and $4P=P$ bonds
- D$6P-P, 12P-O$ and $4P=P$ bonds
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$(I)$ $CrO_4^{2-}$
$(II)$ $MnO_4^-$
$(III)$ $Cr_2O_7^{2-}$ ?

Set $1$ : $Zn(OH)_2(s)$ and $OH^-(aq)$
Set $2$ : $Zn(OH)_2(s)$ and $H_2O(l)$
Set $3$ : $Zn(OH)_2 (s)$ and $H^+(aq)$
Set $4$ : $Zn(OH)_2(s)$ and $NH_3(aq)$