MCQ
The diamagnetic specie is
- ✓${[Ni{(CN)_4}]^{2 - }}$
- B${[NiC{l_4}]^{2 - }}$
- C${[CoC{l_4}]^{2 - }}$
- D${[Co{F_6}]^{2 - }}$

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$X\xrightarrow[{\left( 2 \right)\,{H_2}O}]{{\left( 1 \right)\,LiAl{H_4}}}P$
$Y\xrightarrow[{\left( 2 \right)\,{H_2}O}]{{\left( 1 \right)\,LiAl{H_4}}}Q$
Incorrect statement for $X, Y, P$ and $Q$ is

$(A)$ 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.