Q: What is the correct electronic configuration of the central atom in K4[Fe(CN)6] based on crystal field theory?

K4[Fe(CN)6] Fe ground state: [Ar]3d64s2 Fe2+:3d64s0

Q: The type of isomerism shown by the complex [CoCl2(en)2] is :

In [CoCl2(en)2] , Coordination number of Co is 6 and this compound has octahedral geometry.

Q: Among the following complexes the one which shows Zero crystal field stabilization energy (CFSE):

Due to d5 configuration and H2O is a weak ligand

Q: A magnetic moment of 1.73BM will be shown by one among the following:

[Cu(NH3)4]2+Cu+2μμμμ=[Ar]3 d9=n(n+2)=1(1+2)=3=1.73 B.M. n=1 B.M.

Q: An excess of AgNO3 is added to 100 mL of a 0.01M solution of dichlorotetraaquachromium(III) chloride. The number of moles of AgCl precipitated would be:

AgNO3+[Cr(H2O)4Cl2]Cl→AgCl Excess mole =0.01×1000100=0.001=MV(it )

Q: Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+ is:

The order of the ligand in the spectrochemical seriesH2O<NH3< en Hence, the wavelength of the light observed will be in the order[Co(H2O)6]3+<[Co(NH3)6]3+<[Co(en)3]3+ Thus, wavelength absorbed will be in the opposite orderi.e., [Co(en)3]3+,[Co(NH3)6]3+[Co(H2O)6]3+

Question 1

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

Accepted Answer

Spectrochemical series (as given in NCERT) :

Question 2

What is the correct electronic configuration of the central atom in K4​[Fe(CN)6​] based on crystal field theory?

Accepted Answer

K4​[Fe(CN)6​] Fe ground state: [Ar]3d64s2 Fe2+:3d64s0

Question 3

Which one of the following elements is unable to form MF63−​ ion?

Accepted Answer

∵  'B' has no vacant d-orbitals in its valence shell, so it can't extend its covalency beyond 4. i.e. 'B' cannot form the ion like MF6​3(−)  i.e. BF63(−)​ Hence, the correct option is (1).

Question 4

The type of isomerism shown by the complex [CoCl2​(en)2​] is :

Accepted Answer

In [CoCl2​(en)2​] , Coordination number of Co  is 6 and this compound has octahedral geometry.

Question 5

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

Accepted Answer

Metal carbon bond in metal carbonyls possess both σ and π character. M – C π bond is formed by donation of a pair of electrons from filled orbital of metal into vacant antibonding π orbital of CO. CO bond length increases if M has more tendency to donate lone pair by metal more CO bond length.

Question 6

Among the following complexes the one which shows Zero crystal field stabilization energy (CFSE):

Accepted Answer

Due to d5  configuration and H2​O  is a weak ligand

Question 7

Which of the following complexes is :

Accepted Answer

Cis-platin is used as an anticancer unit.

Question 8

A magnetic moment of 1.73BM  will be shown by one among the following:

Accepted Answer

[Cu(NH3​)4​]2+Cu+2μμμμ​=[Ar]3 d9=n(n+2)​=1(1+2)​=3​=1.73 B.M. ​n=1 B.M. ​

Question 9

An excess of AgNO3​  is added to 100 mL  of a 0.01M  solution of dichlorotetraaquachromium(III) chloride. The number of moles of AgCl  precipitated would be:

Accepted Answer

AgNO3​+[Cr(H2​O)4​Cl2​]Cl→AgCl Excess ​ mole =0.01×1000100​=0.001​=MV(it ​)

Question 10

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+  is:

Accepted Answer

The order of the ligand in the spectrochemical seriesH2​O<NH3​< en  Hence, the wavelength of the light observed will be in the order[Co(H2​O)6​]3+<[Co(NH3​)6​]3+<[Co(en)3​]3+ Thus, wavelength absorbed will be in the opposite orderi.e., [Co(en)3​]3+,[Co(NH3​)6​]3+[Co(H2​O)6​]3+

Question 11

Pick out the correct statement with respect[Mn(CN)6​]3– :

Accepted Answer

In the complex [[Mn(CN)6​]3–, theMn3+ ion has d4 outer electronic configuration.

It is an inner orbital complex. Inner d orbitals are used which results in d2sp3 hybridisation.

The molecular geometry is octahedral.

Question 12

The name of complex ion, [Fe(CN)6​]3− is :

Accepted Answer

[Fe(CN)6​]3− Hexacyanidoferrate (III) ion

Question 13

The hybridization involved in complex [Ni(CN)4​]2− is: (Atomic number of Ni = 28)

Accepted Answer

[Ni(CN)4​]2− Oxidation state of Ni is +2x − 4 = 2x = +2

Question 14

The sum of coordination number and oxidation number of metal M in the complex [M(en)2​(C2​O4​)]Cl Where en is ethylenediamine) is:

Accepted Answer

[M(en)2​(C2​O4​)]Cl Oxidation state of M = +3Coordination number of M = 6Sum of oxidation state + Coordination number = 3 + 6 = 9

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Solution for Class 12, Chemistry, Coordination Compounds

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