MCQ
A group of atoms can function as a ligand only when
- AIt is a small molecule
- ✓It has an unshared electron pair
- CIt is a negatively charged ion
- DIt is a positively charged ion
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$R-NH_2$ $\xrightarrow[{HCl}]{{NaN{O_2}}}$ $..................$
(a gas is evolves with brisk effervescene is)


Reason : Oxidation state of $Cr$ in $Na_2CrO_4$ is $+VI$