AIIMS (All India Institute of Medical Sciences) Chemistry: Questions 69 - 73 of 123

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Passage

DIRECTIONS: Read the passage given below and answer the questions that follows:

The distribution of electrons among various molecular orbitals is called the electronic configuration of the molecule which provides us the following very important information about the molecule.

(I) Stability of molecule: The molecule is stable if number of bonding molecular orbital electrons is greater than the number of anti-bonding molecular orbital electrons .

(II) Bond order: Bond order

A positive bond order means a stable molecule while a negative or zero bond order means an unstable molecule.

(III) Nature of the bond: Bond order corresponds to single, double and triple bonds respectively.

(IV) Bond length: Bond length decreases as bond order increases.

(V) Magnetic nature: If molecular orbitals in a molecule are doubly occupied, the substance is diamagnetic and if one or more molecular orbitals are singly occupied, it is paramagnetic.

Question number: 69 (2 of 3 Based on Passage) Show Passage

» Chemical Bonding » Molecular Orbital Theory » Bond Order

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MCQ▾

Question

Which of the following statement is incorrect?

Choices

Choice (4)Response

a.

In molecule, the energy of is more than and

b.

and are diamagnetic

c.

Molecule does not exist as the bonding and anti-bonding orbitals cancel each other

d.

Among , and the bond length decreases as

Question number: 70 (3 of 3 Based on Passage) Show Passage

» Chemical Bonding » Molecular Orbital Theory » Bond Order

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MCQ▾

Question

The following molecules/species have been arranged in the order of their increasing bond orders. Identify the correct order:

(I)

(II)

(III)

(IV)

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 71

» Chemical Bonding » Molecular Orbital Theory » Important Features

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Assertion-Reason▾

Question

Assertion (Ꭺ)

is planar at each nitrogen atom.

Reason (Ꭱ)

In , the bond angle is I and both the bond lengths are not equal.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Question number: 72

» States of Matter » Solid State » Packing in Solids (Fcc, Bcc and Hcp Lattices)

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MCQ▾

Question

In the closest packed structure of a metallic lattice, the number of nearest neighbors of a metallic atom is

Choices

Choice (4)Response

a.

Eight

b.

Twelve

c.

Four

d.

Six

Passage

DIRECTIONS: Read the passage given below and answer the questions that follows:

SOMMERFIELD’S CONCEPT

(a) Somerfield in 1915, introduced a new atomic model to explain line spectrum of hydrogen atom

(b) He proposed that the moving electron might describe elliptical, . drifts in addition to circular, orbits and the nucleus is situated at one of the foci.

(c) During motion on a circle, only the angle of revolution changes while the distance from the nucleus remains the same but in elliptical motion both the angle of revolution and the distance of the electron from the nucleus change.

(d) The distance from the nucleus is termed as radius vector and the angle of revolution is known as azimuthal angle.

(e) The tangential velocity of the electron at a particular instant can be resolved into two components. One along me radius vector called radial; velocity and the other perpendicular to the radius vector called transverse or angular velocity.

(f) These two velocities give rise to radial momentum and angular or azimuthal momentum.

(g) Summer field proposed that both the momenta must be integral multiples, radial momentum = , Azimumal momentum =

Question number: 73 (1 of 3 Based on Passage) Show Passage

» Atomic Structure » Spectrum of Hydrogen Atom

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MCQ▾

Question

To give designation to an orbital, we need -

Choices

Choice (4)Response

a.

Principal, azimuthal and magnetic quantum numbers

b.

Azimuthal and magnetic quantum number

c.

Principal and magnetic quantum number

d.

Principal and azimuthal quantum number

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