MCQ
Which one of the following is paramagnetic
- A${H_2}O$
- ✓$N{O_2}$
- C$S{O_2}$
- D$C{O_2}$
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[Given : $pKa$ (acetic acid) $=4.74$ ]



$\begin{array}{*{20}{c}}
{\,\,\,\,\,H} \\
{\,\,\,\,\,\,|} \\
{C{H_3}C{H_2} - N - CHO}
\end{array}$
$Ca(OH)_2 + H_3PO_4\to CaHPO_4 + 2H_2O$ is