Filling Up Electrons in Field Split Orbitals

Q. Which of the following is an outer orbital complex and exhibits paramagnetic behaviour?

1. $[Co{F}_6{]}^{3-}$
2. $\left[Ni\right(N{H}_3{)}_6{]}^{2+}$
3. $\left[Zn\right(N{H}_3{)}_6{]}^{2+}$
4. (a) and (b) above.

Q. What is the CFSE value of $d^6$ octahedral complex at weak field ?

1. $-1.2{\Delta }_o$
2. $0$
3. $-2.4{\Delta }_o$
4. $-0.4{\Delta }_o$

Q. Among the following the inner orbital complex is

1. $[CuC{l}_4{]}^{2-}$
2. $\left[Ni\right(H_{2}O{)}_6{]}^{2+}$
3. $\left[Co\right(CN{)}_6{]}^{3-}$
4. $(NiC{l}_4{)}^{2-}$

Q. Which one of the following complexes is an outer orbital complex

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

Q. The crystal field splitting energy for octahedral $\left({\Delta }_0\right)$ and tetrahedral $\left({\Delta }_t\right)$ complexes are related as :

1. ${\Delta }_t=\frac{4}{9}{\Delta }_0$
2. ${\Delta }_t=\frac{1}{2}{\Delta }_0$
3. ${\Delta }_0=2{\Delta }_t$
4. ${\Delta }_0=\frac{4}{9}{\Delta }_t$

Q. Consider, $P{F}_5,Br{F}_5,PC{l}_3,S{F}_6,[IC{l}_4,{]}^{-},CI{F}_3$ and $I{F}_5$.
Amongst the above molecule(s)/ion(s), the number of molecule(s)/ion(s) having $s{p}^3{d}^2$ hybridisation is ______.

Q. Electronic configuration of $\left[Cu\right(N{H}_3{)}_6{]}^{2+}$ on the basis of crystal field splitting theory is :

1. $t_{2g}^4{e}_g^5$
2. $t_{2g}^6{e}_g^3$
3. $t_{2g}^9{e}_g^0$
4. $t_{2g}^5{e}_g^4$

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. Which statement regarding $\left[Cr\right(N{H}_3{)}_6{]}^{3+}$ is incorrect?

1. It has octahedral geometry
2. It has $d^{2}s{p}^3$ hybridisation
3. It is diamagnetic
4. It is low spin complex

Q. Which of the following is/are correct relations for crystal field splitting energy of octahedral $\left({\Delta }_o\right)$, square planar $\left({\Delta }_{sp}\right)$ and tetrahedral $\left({\Delta }_t\right)$ complexes?

1. ${\Delta }_t=\frac{4}{9}{\Delta }_0$
2. ${\Delta }_{sp}=1.3{\Delta }_0$
3. ${\Delta }_o=1.3{\Delta }_{sp}$
4. (a) and (b) above.

Q. The spin only magnetic moment of $Fe$ in the complex $\left[Fe\right(CN{)}_6{]}^{3-}$ in BM is:

1. 1.414 BM
2. 1.73 BM
3. 2.82 BM
4. 2 BM

Q.

Among $\left[Ni\right(Co{)}_4],[NiC{l}_4{]}^{2-},\left[Co\right(N{H}_3{)}_{4}C{l}_2]Cl,N{a}_2[Co{F}_6{]}^{3+},N{a}_2{O}_{2}andCs{O}_2,$ the total number of paramagnetic compounds is

1. 2

2. 3

3. 4

4. 5

Q. CFSE value of $d^6$ octahedral complex at weak field is $-x{\Delta }_o$. x is

Q. The ferricyanide complex ion is ____

1. paramagnetic
2. outer orbital complex
3. tetrahedral
4. All of the above

Q. In a high spin octahedral complex, the $d^7$ configuration according to CFT is

1. $t_{2g}^4,e^{3}g$
2. $t_{2g}^5,e^{2}g$
3. $t_{2g}^3,e^{4}g$
4. $t_{2g}^6,e^{1}g$

Q. Arrange the following in increasing order of lattice energy:

1. $NaI<NaBr<NaCl<NaF$
2. $NaF<NaCl<NaBr<NaI$
3. $NaI<NaCl<BaBr<NaF$
4. None of these

Q.

Which of the following complex is/are low spin complex(es)?

1. $\left[Co\right(N{H}_3{)}_6{]}^{3+}$

2. $[Co{F}_6{]}^{3-}$

3. $\left[Fe\right(H_{2}O{)}_6{]}^{2+}$

4. $\left[Fe\right(CN{)}_6{]}^{4-}$

Q. Which of the following is not expected to show paramanganetism ?

1. $\left[Ni\right(H_{2}O){]}^{2+}$
2. $Ni(CO{)}_4$
3. $\left[Ni\right(N{H}_3{)}_4{]}^{2+}$
4. $\left[Co\right(N{H}_3{)}_6{]}^{2+}$

Q. In octahedral ligand field which of the metal's d-orbitals will feel higher repulsion?

1. $d_{xy},d_{yz},d_{zx}$
2. $d_{x^2-y^2},d_{z^2}$
3. $d_{xz},d_{yz},d_{z^2}$
4. $d_{xy},d_{yz},d_{zx},d_{x^2-y^2},d_{z^2}$

Q. If ${\Delta }_o$ and ${\Delta }_t$ represent crystal field splitting energies for d-orbitals for octahedral and tetrahedral geometries respectively, then for $d^6$ (high spin in both cases), what are CFSE (ignore the pairing energy) respectively?

1. $0.6{\Delta }_o$ and $0.6{\Delta }_t$
2. $0.4{\Delta }_o$ and $0.4{\Delta }_t$
3. $0.4{\Delta }_o$ and $0.6{\Delta }_t$
4. $0.6{\Delta }_o$ and $0.4{\Delta }_t$

Q. A $3d$ series metal cation forms octahedral complexes with both ${}^{-}SCN$ as well ${}^{-}CN$ ions as ligands. The complex $\left[M\right(CN{)}_6{]}^{3-}$ has a spin only magnetic moment of $\sqrt{3}BM$ whereas the complex ${\left[M\right(SCN{)}_6]}^{3-}$ has a spin only magnetic moment of $\sqrt{35}BM$. Then out of the following, metal $M$ can be

1. $Fe$
2. $Mn$
3. $Co$
4. $Ni$

Q. The splitting of degenerated d-orbitals takes place into which of the following two sets:

1. $d_{xy},d_{z^2}$ and $d_{yz},d_{x^2-y^2}$
2. $d_{xy},d_{yz},d_{zx}$ and $d_{x^2-y^2},d_{z^2}$
3. $d_{x}y,d_{x^2-y^2},d_{z^2}$ and $d_{yz},d_{xz}$
4. $d_{xy},d_{x^2-y^2},d_{xz}$ and $d_{yz},d_{z^2}$

Q. Calculate crystal field stabilization energy for the complex $\left[Cu\right(N{H}_3{)}_6{]}^{2+}$.

1. $0.4{\Delta }_t$
2. $-0.6{\Delta }_0$
3. $2.4{\Delta }_t$
4. $0.6{\Delta }_0$

Q. (i)Draw the geometrical isomers of complex $\left[Co\right(en{)}_{2}C{l}_2{]}^{+}.$

(ii) On the basis of crystal field teory, write the electronic configuration for $d^4$ ion if ${\Delta }_0>P.$

(iii) $[NiC{l}_4{]}^{2-}$ is paramagnetic while $\left[Ni\right(CO{)}_4]$ is diamagnetic, though both are tetrahedral. Why? (Atomic number of Ni =28)

Q. $N{a}_{2}S+N{a}_2\left[Fe\right(CN{)}_{5}NO]⟶X(purplecolor)$

Q. In an octahedral complex, CFSE $\left(In{\Delta }_{0}units\right)$ will be zero in a strong ligand field for a:

1. $d^{5}case$
2. $d^{6}case$
3. $d^{3}case$
4. $d^{10}case$

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

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

Q. Which of the following statements is not true?

1. $\left[Mn\right(CN{)}_6{]}^{2–}$ ion has octahedral geometry and is paramagnetic
2. $[CuC{l}_4{]}^{2–}$ has square planar geometry and is paramagnetic
3. $\left[NiB{r}_2\right(P{h}_{3}P{)}_2]$ has sqare planar geometry and has no unpaired electrons
4. $MnC{l}_4^{2–}$ ion has tetrahedral geometry and is paramagnetic

Q. Out of $PC{l}_3,PC{l}_5,NC{l}_5$ and $NC{l}_3$, least stable is :

1. $NC{l}_3$
2. $PC{l}_3$
3. $NC{l}_5$
4. $PC{l}_5$

Q.

Which of the following complex is/are low spin complex(es)?

1. $\left[Co\right(N{H}_3{)}_6{]}^{3+}$

2. $[Co{F}_6{]}^{3-}$

3. $\left[Fe\right(H_{2}O{)}_6{]}^{2+}$

4. $\left[Fe\right(CN{)}_6{]}^{4-}$