AIIMS (All India Institute of Medical Sciences) Chemistry: Questions 74 - 78 of 123

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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 number: 74 (2 of 3 Based on Passage) Show Passage

» Atomic Structure » Bohr Model of Hydrogen Atom

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MCQ▾

Question

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

Question number: 75 (3 of 3 Based on Passage) Show Passage

» Atomic Structure » Spectrum of Hydrogen Atom

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MCQ▾

Question

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

Question number: 76

» Chemical Bonding » Molecular Orbital Theory » Bond Length

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MCQ▾

Question

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

Question number: 77

» Chemical Bonding » Molecular Orbital Theory » Bond Order

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MCQ▾

Question

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

Question number: 78

» States of Matter » Solid State » Classification of Solids

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MCQ▾

Question

The three states of matter are solid, liquid and gas. Which of the following statement is/are true about them?

Choices

Choice (4)Response

a.

The molecules in solid state do not have translational motion.

b.

Solids and liquids have viscosity as a common property

c.

Solids and liquids have vapour pressure as a common property

d.

Gases cannot be converted into solids without passing through the liquid phase

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