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AIIMS (All India Institute of Medical Sciences) Chemistry: Questions 72 - 77 of 123

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Question 72

Question MCQ▾

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

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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 73 (1 of 3 Based on Passage)

Question MCQ▾

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

Edit

Question 74 (2 of 3 Based on Passage)

Question MCQ▾

The elliptical orbits of electron in the atom were proposed by-

Choices

Choice (4)Response

a.

Bohr

b.

Summer field

c.

Thomson

d.

De Broglie

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Question 75 (3 of 3 Based on Passage)

Question MCQ▾

Choose the correct statements -

Choices

Choice (4)Response

a.

Sommerfeld model gives introduction of elliptical orbitals.

b.

The relation between principal (n) and azimuthal

c.

Energies of subshells follow the order

d.

All a., b. and c. are correct

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Question 76

Question MCQ▾

The dipole moment of the ammonia molecule is . The length of the dipole is –

Choices

Choice (4)Response

a.

m

b.

c.

d.

Question does not provide sufficient data or is vague

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Question 77

Question MCQ▾

Which of the following have identical bond order?

(1)

(2)

(3)

(4)

Choices

Choice (4)Response

a.

1 and 3 are correct

b.

1,2 and 3 are correct

c.

1 and 2 are correct

d.

2 and 4 are correct

Edit