Filling Up Electrons in Field Split Orbitals

Q. The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is
$\left(A\right)Ni(CO{)}_4$
$\left(B\right)\left[Ni\right(H_{2}O{)}_6]C{l}_2$
$\left(C\right)N{a}_2\left[Ni\right(CN{)}_4]$
$\left(D\right)PdC{l}_2(PP{h}_3{)}_2$

1. $\left(C\right)<\left(D\right)<\left(B\right)<\left(A\right)$
2. $\left(A\right)\approx \left(C\right)<\left(B\right)\approx \left(D\right)$
3. $\left(C\right)\approx \left(D\right)<\left(B\right)<A)$
4. $\left(A\right)\approx \left(C\right)\approx \left(D\right)<\left(B\right)$

Q. Which of the following is a high spin complex?

1. $\left[Co\right(N{H}_3{)}_6{]}^{3+}$
2. $\left[Fe\right(CN{)}_6{]}^{4-}$
3. $\left[Ni\right(CN{)}_4{]}^{2-}$
4. $[Fe{F}_6{]}^{4-}$

Q. Crystal field splitting energy (CFSE) for the complex $\left[Fe\right(CN{)}_4{]}^{-}$ is ____ , when $\Delta >P$.

1. $-2.0$
2. $\Delta +P$
3. $2+P$
4. $0$

Q. Which of the following has square planar geometry?

1. $[CoC{l}_4{]}^{2-}$
2. $[FeC{l}_4{]}^{2-}$
3. $[NiC{l}_4{]}^{2-}$
4. $[PtC{l}_4{]}^{2-}$

Q.

Which of these statements about $\left[Co\right(CN{)}_6{]}^{3-}$ is true?

1. $\left[Co\right(CN{)}_6{]}^{3-}$ has no unpaired electrons and will be in a low-spin configuration.

2. $\left[Co\right(CN{)}_6{]}^{3-}$ has four unpaired electrons and will be in a low-spin configuration.
   

3. $\left[Co\right(CN{)}_6{]}^{3-}$ has four unpaired electrons and will be in a high-spin configuration.
   

4. $\left[Co\right(CN{)}_6{]}^{3-}$ has no unpaired electrons and will be in a high-spin configuration.