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Atomic Structure [AIIMS (All India Institute of Medical Sciences) Chemistry]: Questions 1 - 4 of 9

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Question 1

Question

Assertion-Reason▾

Assertion(Ꭺ)

The atoms of different elegists having same mass number but different atomic number are known as isobars.

Reason(Ꭱ)

The sum of protons and neutrons, in the isobars is always different.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

Question 2

Question

MCQ▾

Choose the correct options for hydrogen atom –

(1) =

(2) =

(3) =

(4)

Choices

Choice (4)Response

a.

1,2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

Question 3

Question

MCQ▾

Choose the correct statements -

  1. The difference in energy between 1st and 2nd Bohr orbit for a H atom is
  2. At minimum atomic , a transition from energy level would result in die emission of X-ray with .
  3. The difference in energy between 1st and 2nd Bohr orbit for an is
  4. At minimum atomic no. 4, a transition from energy level would result in the emission of X- ray with m.

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

2 and 4 are correct

d.

1,2 and 3 are correct

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 4 (1 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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