MCQ
Select the correct statement about the given complex


- AIt has four ions in aqueous solution
- BPrimary valency of cobalt is six.
- ✓It give one mole of $AgCl$ ppt on reaction with excess of $AgNO_3$.
- DIt has one primary valency

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[Given : $\mathrm{R}=0.083 \mathrm{~L} \mathrm{bar} \mathrm{mol}^{-1} \mathrm{~K}^{-1}$ ]
Assume complete dissociation of $\mathrm{NaCl}$
$(A)$ Upon heating, $H _3 PO _3$ undergoes disproportionation reaction to produce $H _3 PO _4$ and $PH _3$.
$(B)$ While $H _3 PO _3$ can act as reducing agent, $H _3 PO _4$ cannot.
$(C)$ $H _3 PO _3$ is a monobasic acid.
$(D)$ The $H$ atom of $P - H$ bond in $H _3 PO _3$ is not ionizable in water.