MCQ
In ${N_2}$ molecule, the atoms are bonded by
- ✓One $\sigma$ , Two $\pi$
- BOne $\sigma$, One $\pi$
- CTwo $\sigma$, One $\pi$
- DThree $\sigma$ bonds

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$(A)\,\,\,\,[Ni(H_2O)_5NH_3]^{2+},$
$(B)\,\,\,\,[Ni(H_2O)_4(NH_3)_2]^{2+}$ and
$(C)\,\,\,\,[Ni(H_2O)_3(NH_3)_3]^{2+}$ is