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CFT

Total questions: 10

Worksheet time: 7mins

Name
Class
Date
1.

CFT views the interaction between metal ions and ligands in complexes in terms of electrostatic _______________ and ____________________.

a)

attraction, repulsion

b)

positive, negative

c)

cation, anion

2.

When the ligands move along the x, y and z axes of d orbital in metal ion (octahedral geometry), they approach directly toward or between the lobes. Name the d orbitals that feel less repulsion?

a)

dz2

b)

dxy and dxz

c)

dxy, dxz and dyz

d)

dz2 and dx2- y2

3.

When the ligands move along the x, y and z axes of d orbital in metal ion (tetrahedral geometry), none of the five d orbitals is directly in their path. Name the d orbitals that feel strong repulsion?

a)

dz2 and dx2- y2

b)

dxy, dxz and dyz

c)

dxy and dxz

d)

dz2

4.

The energy diagram of the d orbital energy splitting complexes in octahedral geometry, shows the d orbitals with higher in energy (eg) which refer to _____________ d orbitals

a)

dxy, dxz and dyz

b)

dxy and dxz

c)

dz2 and dx2- y2

d)

dz2

5.

The energy diagram of the d orbital energy splitting complexes in tetrahedral geometry, shows the d orbitals with higher in energy (t2g) which refer to _____________ d orbitals

a)

dz2 and dx2- y2

b)

dz2

c)

dxy and dxz

d)

dxy, dxz and dyz

6.

Calculate CFSE in a d6 system in strong ligand field

a)

-4 Dq

b)

-24 Dq

c)

-24Dq + P

d)

-24 Dq + 2P

7.

Which of following has highest CFSE

a)

[Cr(H2O)6]3+

b)

[Mn(H2O)6]2+

c)

[FeCl4]2-

d)

[TiF6]3-

8.

Given [Ni(H2O)6]2+ (high spin). Calculate ΔCFSE and give configuration in term of t2g and eg.

a)

1.2 Δt, t2g6eg2

b)

2.6 Δsp, t2g5eg2

c)

1.2 Δ0, t2g6eg2

d)

2.6 Δ0, t2g1eg

9.

The weakness of CFT are

i) Fails to explain how arrangement of electron configuration in d-orbital.

ii) Fails to explain why the F- ion has very ionic property

III) Fails to explain why the CN- and CO give very high ligand field effect with all metal.

Iv) Fails to estimate relative stability among complexes by using ECFSE.

a)

I, II and III

b)

II and III

c)

I and III

d)

All of the above.

10.

What is the difference between VBT and CFT?

a)

VBT explains about formation of colour while CFT explains about the variation in magnetic moments.

b)

CFT explains the mixing of orbitals meanwhile VBT explains the mixing of orbitals.

c)

VBT explains the mixing of orbitals whereas CFT explains the splitting of orbitals.

d)

VBT stands for Valence Bond Term and CFT stands for Complex Field Theory