Atomic Structure (KVPY Stream-SA (Class 11) Chemistry): Questions 24 - 27 of 30

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Question number: 24

» Atomic Structure » Nature of Electromagnetic Radiation

Assertion-Reason▾

Assertion (Ꭺ)

Splitting of the spectral lines in the presence of magnetic field known as stark effect.

Reason (Ꭱ)

Line spectrum is simplest for hydrogen atom.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 25

» Atomic Structure » De-Broglie's Relationship

Appeared in Year: 2014

MCQ▾

Question

If the Planck’s constant h = Equation Js, the de-Broglie wavelength of a particle having momentum of Equation kg. m. s-1 will be -

Choices

Choice (4) Response

a.

0.2 Å

b.

0.02 Å

c.

0.002 Å

d.

2 Å

Question number: 26

» Atomic Structure » Shapes of S, P and D - Orbitals

MCQ▾

Question

Choose the correct statements -

(1) Designation for the orbital with the quantum number n = 3, ℓ = 1, m =-1 may be 3px or 3py

(2) Designation for the orbital with the quantum number n = 4, = 2, m =+2 may be 4dxy or 4d x2 – y2

(3) Designation for me orbital with the quantum number n = 5, = 0, m = 0 may be 5s

(4) Designation for the orbital with the quantum number n = 2, = 1, m = 0 may be 3pz

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

Passage

Einstein had suggested that light could behave as a wave as well as like a particle i. e. it has dual character. In 1924, de-Broglie proposed that an electron, behaves both as a material particle and as a wave. This proposed a new theory wave mechanical theory of matter. According to this theory, the electrons, protons and even atom when in motion possess wave properties. According to de-Broglie, the wavelength associated with a particle of mass m, moving with velocity v is given by the relation, λ = h/mv where h is Planck’s constant.

Question number: 27 (1 of 3 Based on Passage) Show Passage

» Atomic Structure » Quantum Mechanics

MCQ▾

Question

K. E. Of the electron is Equation . Calculate the frequency of its wave.

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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