Types of Complexes Based on Ligands

Q. The CFSE value of $d^5$ configuration of octahedral complex in presence of strong field ligand is '$-x{\Delta }_o$'. what is the value of 'x'

1. 2.0
2. 2.4
3. 1.8
4. 3.0

Q.

List examples of positive and negative ligands.

Q. In which of the following coordination entities the magnitude of ${\Delta }_o$ (CFSE in octahedral feild ) will be maximum? (Atomic number of $Co=27$)

1. $\left[Co\right(H_{2}O{)}_6{]}^{3+}$
2. $\left[Co\right(N{H}_3{)}_6{]}^{3+}$
3. $\left[Co\right(CN{)}_6{]}^{3+}$
4. $\left[Co\right(C_2{O}_4{)}_3{]}^{3+}$

Q. What will be the CFSE value of $d^7$ configuration of octahedral complex in presence of strong field igand?

1. $-2.4{\Delta }_o$
2. $-1.4{\Delta }_o$
3. $-1.8{\Delta }_o$
4. 0

Q. Which of the following are homoleptic?

1. $\left[Co\right(N{H}_3{)}_6{]}^{3+}$
2. $\left[Co\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$
3. $\left[Ni\right(CN{)}_4{]}^{2-}$
4. $\left[Ni\right(N{H}_3{)}_{4}C{l}_2{]}^{3+}$

Q. The spin only magnetic moment value (in B.M.) of the complex $[FeC{l}_6{]}^{4-}$ is:

1. $3.9\text{B.M.}$
2. $4.9\text{B.M.}$
3. $5.9\text{B.M.}$
4. $2.9\text{B.M.}$

Q.

Which of the following complexes are heteroleptic?
(a)$\left[Cr\right(N{H}_3{)}_6{]}^{3+}$
(b)$\left[Fe\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$
(c)$\left[Mn\right(CN{)}_6{]}^{4-}$
(d)$\left[Co\right(N{H}_3{)}_{4}C{l}_2]$

Q. In which of the following octahedral complexes of $Co$ (Z = 27) will the magnitude of ${\Delta }_0$ be the highest?

1. $\left[Co\right(N{H}_3{)}_6{]}^{3+}$
2. $\left[Co\right(CN{)}_6{]}^{3-}$
3. $\left[Co\right(C_2{O}_4{)}_3{]}^{3-}$
4. $\left[Co\right(H_{2}O{)}_6{]}^{3+}$

Q. What is the number of unpaired electron in $\left[Fe\right(H_{2}O{)}_6{]}^{2+}$ if is known to be a high spin complex ?

1. 0
2. 2
3. 3
4. 4

Q.

Give examples of positive radicals

Q. What is the crystal field stabilization energy (CFSE) of $\left[Fe\right(H_{2}O{)}_6{]}^{2+}$?

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

Q. Extent of physisorption of a gas increases with

Q. If which of the following orders the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment?
(i) $[Fe{F}_6{]}^{3-}$
(ii) $\left[Co\right(N{H}_3{)}_6{]}^{3+}$
(iii) $[NiC{l}_4{]}^{2-}$
(iv) $\left[Cu\right(N{H}_3{)}_4{]}^{2+}$

1. $\left(ii\right)>\left(i\right)>\left(iii\right)>\left(iv\right)$
2. $\left(iii\right)>\left(iv\right)>\left(ii\right)>\left(i\right)$
3. $\left(ii\right)>\left(iii\right)>\left(i\right)>\left(iv\right)$
4. $\left(i\right)>\left(iii\right)>\left(iv\right)>\left(ii\right)$

Q. For which of the following types of ions is the number of unpaired electron in octahedral complexes fixed at the same number as in the free ion no matter, how weak or strong the crystal field is ?

1. $d^3$
2. $d^4$
3. $d^5$
4. $d^6$

Q. Among the following complexes, the one which shows zero crystal field stabilization energy (CFSE) is:

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

Q. Which of the following complexes are heteroleptic?

1. $\left[Cr\right(N{H}_3{)}_6{]}^{3+}$
2. $\left[Fe\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$
3. $\left[Mn\right(CN{)}_6{]}^{4-}$
4. $\left[Co\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$

Q. Find out the wrong statement for an octahedral complex:

1. An ion with $d^6$ configuration is diamagnetic in presence of strong field ligand
2. An ion with $d^5$ configuration has one unpaired electron both in weak and strong fields
3. A central metal ion with $d^8$ configuration has two unpaired electrons irespective of the nature of the ligand
4. In $d^4,d^5,d^6\text{and}{d}^7$ configuration, metal ions have different number of unpaired electrons in presence of weak and strong field ligands respectively

Q. The number of bridging $CO$ ligand (s) and $Co-Co$ bond (s) in $C{o}_2(CO{)}_8$, respectively are:

1. 0 and 2
2. 2 and 0
3. 4 and 0
4. 2 and 1

Q. Which of the following compounds consists of a homoleptic complex ?

1. $\left[Co\right(N{H}_3{)}_6]C{l}_3$
2. $\left[Co\right(N{H}_3{)}_{5}Cl]C{l}_2$
3. $\left[Co\right(N{H}_3{)}_{4}C{l}_2]Cl$
4. $\left[Co\right(N{H}_3{)}_5\left(C{O}_3\right)]Cl$

Q. Give reason :
$\left[Fe\right(H_{2}O{)}_6{]}^{3+}$ is strongly para magnetic whereas $\left[Fe\right(CN{)}_6{]}^{3-}$ is weakly para magnetic

Q. The CFSE value of $d^5$ configuration of octahedral complex in presence of strong field ligand is '$-x{\Delta }_o$'. what is the value of 'x'

Q. Which of the following statement(s) is/are true for crystal field splitting of tetrahedral complex?

1. $d_{xy},d_{yz},d_{xz}$ have higher energy than ​$d_{x^2-y^2},d_{z^2}$
2. All $d_{xy},d_{yz},d_{xz}$ orbitals have same energy
3. ​$d_{x^2-y^2},d_{z^2}$ orbitals located near to ligand approach direction
4. $d_{x^2-y^2}$ has higher energy than $d_{z^2}$ orbital

Q. Which of the following complexes are diamagnetic :

1. $[AuC{l}_4{]}^{{-}^{}}$
2. $\left[Co\right(H_{2}O{)}_6{]}^{3+}$
3. $[Co{F}_6{]}^{3-}$
4. $\left[Co\right(CO{)}_4{]}^{-}$

Q.

A bidentate ligand is :

1. Water
2. Oxalate ion
3. Carbon monoxide
4. Nitronium ion

Q. Which of the following complexes are heteroleptic?

1. $\left[Cr\right(N{H}_3{)}_6{]}^{3+}$
2. $\left[Fe\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$
3. $\left[Mn\right(CN{)}_6{]}^{4-}$
4. $\left[Co\right(N{H}_3{)}_{4}C{l}_2{]}^{+}$

Q. If $P>{\Delta }_0$ then electronic confirguration of $d^5$ in octahedral complex:

1. $t_{2g}^{3}e{g}^2$
2. $t_{2g}^{5}e{g}^0$
3. $t_{2g}^{4}e{g}^1$
4. $e{g}^5{t}_{2g}$

Q. Consider the following complex ions P, Q and R. $P=[Fe{F}_6{]}^{3-},Q=[V(H_{2}O{)}_6{]}^{2+}\text{and}R=[Fe(H_{2}O{)}_6{]}^{2+}$ The correct order of the complex ions, according to their spin-only magnetic moment values (in B.M.) is

1. R < Q < P
2. Q < R < P
3. R < P < Q
4. Q < P < R

Q. Choose the order of splitting of complex having same metal atom/ion and ligands.

1. Octahedral complex > Tetrahedral complex > Square planar complex
2. Octahedral complex < Tetrahedral complex < Square planar complex
3. Tetrahedral complex < Octahedral complex < Square planar complex
4. Tetrahedral complex > Square planar complex > Octahedral complex

Q. Which of the following statement is true for crystal field splitting of tetrahedral complex?

1. $d_{xy},d_{yz},d_{xz}$ have lower energy than ​$d_{x^2-y^2},d_{z^2}$
2. All $d_{xy},d_{yz},d_{xz}$ orbitals have same energy
3. ​$d_{x^2-y^2},d_{z^2}$ orbitals located near to ligand approach direction
4. $d_{x^2-y^2}$ has higher energy than $d_{z^2}$ orbital

Q. The complex showing a spin only magnetic moment of 2.82 BM is:

1. $\left[Ni\right(CO{)}_4]$
2. $[NiC{l}_4{]}^{2-}$
3. $\left[Ni\right(PP{h}_3{)}_4]$
4. $\left[Ni\right(CN{)}_4{]}^{2-}$