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Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Chemistry MCQ


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10 Questions MCQ Test - Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes

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Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 1

For the central metal atom in a complex, coordination number is

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 1

Coordination number is the number of ligands that surround the metal ion and are linked to it through sigma bonds.

Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 2

The square planar geometry is based on

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 2

The square planar geometry has a hybridisation of either dsp2 and sp2d. The orbitals involved here are s, px, py and dx2 - y2. We can clearly see that there is no involvement of z-direction.
Hence it is based on the z-exclusion principle.

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Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 3

The minimum number of monodentate ligand required for the formation of square planar and tetrahedral complex is

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 3

A monodentate ligand is a ligand that donate electrons to the central metal ion from its one site.
A minimum of 4 such ligands is required for the formation of a tetrahedral (sp3 hybridisation) or square planar (dsp2 hybridisation) complex.

Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 4

The zero magnetic moment of octahedral K2NiF6 is due to

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 4

A low spin complex is formed when the ligands are of strong field strength whereas high spin is characterised by weak field strength.
In K2NiF6 , Ni is in +4 oxidation state with d6 electronic configuration.Here fluoride acts as a strong field ligand resulting in low spin complex.
In a strong field, all of the electrons in d6 are paired up, leaving zero unpaired electrons, corresponding to a zero magnetic moment.
Note: When metal is in +4 oxidation state all ligands act as strong field ligands.

Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 5

Cuprammonium ion has ___________ shape.

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 5

The cuprammonium ion is [Cu(NH3)4]2+.The copper is in +2 oxidation state with the electronic configuration of 3d9. The hybridisation takes place in the following manner:

The dsp2 hybridization corresponds to square planar shape.

Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 6

Which orbital would form a more stronger bond if both of them have identical stability?

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 6

When the two orbitals have identical stability or energy, the one which is more directionally concentrated would form a stronger bond.

Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 7

The p-orbital is in the shape of a _____________

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 7

The p-orbital is in the shape of a Dumbbell. It has 2 lobes that are pointing in opposite directions.

Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 8

According to VBT, the formation of a stable bond requires _____________

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 8

According to VBT, when two atoms come closer to each other with opposite electron spins, due to mutual rearrangements (or overlapping) of their electron clouds, energy changes are produced.

Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 9

Valence Bond Theory was developed in the year?

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 9

The Valence Bond Theory was developed in 1927 by Heitler and London.

Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 10

The s-orbital does not show preference to any direction because _____________

Detailed Solution for Test: Valence Bond Approach: structure, color & magnetic properties of CN Complexes - Question 10

The s-orbital is spherically symmetric in shape so it does not show preference to any direction. It is the same from all the directions.

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