MCQ
Which of the following molecule/ion has maximum $\sigma :\pi $ bond ratio ?
- A$C_3N_3Cl_3$
- B$CO_2$
- C$NO_3^-$
- ✓$P_4O_{10}$

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$(A)$ $NH _4 NO _3$ $(B)$ $\left( NH _4\right)_2 Cr _2 O _7$ $(C)$ $Ba \left( N _3\right)_2$ $(D)$ $Mg _3 N _2$