MCQ
$\pi-$ acid ligands are
- A$CO$
- B$CN^-$
- C$N{O^ \oplus }$
- ✓All of these
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$(A)$ $NH _4 NO _3$ $(B)$ $\left( NH _4\right)_2 Cr _2 O _7$ $(C)$ $Ba \left( N _3\right)_2$ $(D)$ $Mg _3 N _2$

