Bonding in Metal Carbonyls

Q. The CFSE value of tetrahedral $[CoC{l}_4{]}^{2-}$ complex is:

1. $+1.2{\Delta }_t$
2. $-1.2{\Delta }_t$
3. $-1.8{\Delta }_t$
4. $+2.4{\Delta }_t$

Q. Which of the following has longest $C-O$ bond length?
(Free $C-O$ bond length in $CO$ is $1.128\stackrel{o}{A}$)

1. $Ni(CO{)}_4$
2. $\left[Co\right(CO{)}_4{]}^{-}$
3. $\left[Fe\right(CO{)}_4{]}^{2-}$
4. $\left[Mn\right(CO{)}_6{]}^{+}$

Q. In which complex is the $C-O$ bond length maximum?

1. $V(CO{)}_6^{-}$
2. $Cr(CO{)}_6$
3. $Mn(CO{)}_6^{+}$
4. $Fe(CO{)}_6^{2+}$

Q.

Discuss the nature of bonding in metal carbonyls.

Q. Among the following metal carbonyls, the C-O bond order is lowest in:

1. $\left[Mn\right(CO{)}_6{]}^{+}$
2. $\left[Fe\right(CO{)}_5]$
3. $\left[Cr\right(CO{)}_6]$
4. $\left[V\right(CO{)}_6{]}^{-}$

Q.

Which of the following does not have a coordinate bond

1. HNO₂

2. SO₂

3. HNO₃

4. H₂SO₃

Q. Glycinato ligand is

1. 
2. having two donor sites $N$ and $O^{-}$
3. a bidentate ligand
4. All of the above.

Q.

Which of the following are paramagnetic in nature?

1. ${\mathrm{O}}_2$

2. ${{\mathrm{O}}_2}^{+}$

3. ${{\mathrm{O}}_2}^{-}$

4. All of these

Q.

An alloy of copper, silver, and gold was found to have copper constituting CCP lattice. If silver atoms occupy the edge centers and gold is present at the body center, the alloy has a formula:

1. $\mathrm{CuAgAu}$

2. ${\mathrm{Cu}}_4{\mathrm{Ag}}_2\mathrm{Au}$

3. ${\mathrm{Cu}}_4{\mathrm{Ag}}_3\mathrm{Au}$

4. ${\mathrm{Cu}}_4{\mathrm{Ag}}_4\mathrm{Au}$

Q. In the cobalt-carbonyl complex: $\left[C{o}_2\right(CO{)}_8]$, number of $Co-Co$ bonds is ${}^{\prime }{X}^{\prime }$ and terminal $CO$ ligands is ${}^{\prime }{Y}^{\prime }$ Then, $X+Y=$

Q. Incorrect statement about $M{n}_2{O}_7$ is :

1. It is purple in colour
2. $Mn$ is tetrahedrally surrounded by $O$ atom
3. $Mn–O–Mn$ linkage is present
4. It is a covalent oxide

Q.

Which of the following has longest C-O bond length? (Free C-O bond length in CO is 1.128 A.)

1. $\left[Mn\right(CO{)}_6{]}^{+}$

2. $\left[Co\right(CO{)}_4{]}^{-}$

3. $\left[Fe\right(CO{)}_4{]}^{2-}$

4. $Ni(CO{)}_4$

Q. Colour of $F{e}_4\left[Fe\right(CN{)}_6{]}_3$ is

1. Purple
2. Blue
3. White
4. None of the above

Q. Which one of the following has regular tetrahedral structure

1. 
2. 
3. 
4. 

Q. 6 calculate cfse for d6 low spin tetrahedral complex.

Q. The correct statement(s) regarding the binary transition metal carbonyl compounds is/are: (Atomic number: Fe = 26, Ni = 28)

1. Total number of valence shell electrons at metal centre in $Fe(CO{)}_5$ or $Ni(CO{)}_4$ is 16
2. These are predominantly low spin in nature
3. Metal-carbon bond strengthens when the oxidation state of the metal is lowered
4. The carbonyl C - O bond weakens when the oxidation state of the metal is increased

Q. Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?

1. $F{e}_3\left[Fe\right(CN{)}_6{]}_2$
2. $F{e}_4\left[Fe\right(CN{)}_6{]}_3$
3. $F{e}_4\left[Fe\right(CN{)}_6{]}_2$
4. $F{e}_3\left[Fe\right(CN{)}_6{]}_3$

Q. A complex having _____ geometry can have only one type of hybridisation.

1. tetrahedral
2. octahedral
3. linear
4. none of the above

Q. Among the metal carbonyls $\left[Mn\right(CO{)}_6{]}^{+},\left[Ti\right(CO{)}_6],[Cr\left(CO{)}_6\right]$ and $\left[V\right(CO{)}_6{]}^{-}$ the $C-O$ bond order would be lowest in :

1. $\left[Mn\right(CO{)}_6{]}^{+}$
2. $\left[Ti\right(CO{)}_6{]}^{2-}$
3. $\left[Cr\right(CO{)}_6]$
4. $\left[V\right(CO{)}_6{]}^{-}$

Q. Consider the coordination compound, $N{a}_2\left[Pt\right(CN{)}_4]$. The lewis base is

1. $\left[Pt\right(CN{)}_4{]}^{2-}$
2. $N{a}^{+}$
3. $P{t}^{2+}$
4. $C{N}^{-}$

Q. Which of the following statement regarding bonding in metal carbonyls is correct?

1. Metal–carbon bond in metal carbonyls possesses​ only $\sigma$ character.
2. Metal–carbon bond in metal carbonyls possesses​ only $\pi$ character.
3. Metal–carbon $\sigma$ bond is formed by the donation of lone pair of ​ electrons of carbonyl carbon into vacant d-orbital of metal.
4. None of the above

Q.

What is the shape of $Fe(CO{)}_5$ molecule and which of the following d - orbitals involved in hybridization?

1. Tetrahedral $d_{x^2-y^2}$

2. Trigonal bipyramidal, $d_{x^2-y^2}$

3. Trigonal bipyramidal, $d_{z^2}$

4. Square pyramidal

Q.

Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change?

Q. Bond order is associated with the strength of bond and bond length. The higher the bond order, the smaller will be the bond length and stronger will be the bond.

1. $O_2^{2-}<{O_2}^{-}<O_2<O_2^{+}$
2. ${O_2}^{-}<{O_2}^{2-}<O_2^{+}<O_2$
3. $O_2<{O_2}^{-}<O_2^{2-}<O_2^{+}$
4. $O_2^{2+}<O_2^{+}<{O_2}^{-}<O_2$

Q. How many types of hybridisation are possible for complexes with a coordination number of 4?

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

Q. Which of the following isomer(s) represent a 'D' configuration?

1. 
2. 
3. 
4. 

Q. $H_{2}S$ is better reducing agent than water or $H_{2}S$ is thermally less stable than $H_{2}O$. Explain.

Q. Identify the incorrect option from the following?

1. Physical adsorption is multi-layer, non-directional and non- specific
2. Chemisorption is very slow at ​low temperatures​
3. Chemical adsorption increases ​with decrease in surface ​area of the adsorbent.
4. Chemical adsorption is more stronger than physical adsorption

Q. Effective atomic number of $Fe$ in $F{e}_2{\left(CO\right)}_9$ is:

1. $35$
2. $36$
3. $37$
4. Cannot be calculated

Q.

$KH{F}_2$ is stable and exists unlike $KHB{r}_{2}andKH{I}_2$ reason is _____

1. Inter-molecular H-bonding

2. Intra molecular H-bonding

3. Covalent bonding

4. Ionic bonding