Coordination Polyhedra

Q. Crystal field stabilization energy for high spin $d^4$ octahedral complex is:

Q. The number of $\sigma$ and $\pi -$ bonds in $F{e}_2(CO{)}_9$, respectively, are

1. $22\sigma$ and $15\pi$
2. $22\sigma$ and $16\pi$
3. $23\sigma$ and $15\pi$
4. $15\sigma$ and $8\pi$

Q. $\begin{array}{ccc}& \text{Column - I}& \text{Column - II}\\ i.& \left[Ni\right(CO{)}_4]& \text{Planar octahedral, diamagnetic}\\ ii.& \left[Fe\right(NO\left)\right(H_{2}O{)}_5{]}^{2+}& \text{Planar, paramagnetic}\\ iii.& \left[Co\right(N{O}_2{)}_6{]}^{3-}& \text{Octahedral, diamagnetic}\\ iv.& \left[Cu\right(N{H}_3{)}_4{]}^{2+}& \text{Planar octahedral, paramagnetic}\\ & & \text{Octahedral, paramagnetic}\end{array}$

1. $i-r,ii-p,iii-q,iv-t$
2. $i-r,ii-s,iii-q,iv-t$
3. $i-r,ii-s,iii-p,iv-q$
4. $i-r,ii-p,iii-s,iv-q$

Q. $\left[Ni\right(CN{)}_4{]}^{2\ominus }$ and $[NiC{l}_4{]}^{2\ominus }$ are dissimilar with respect to

1. magnetic moment
2. Coordination number
3. structure
4. Both (a) and (c)