KVPY Stream-SA (Class 11) Chemistry: Questions 107 - 111 of 133

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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: 107 (2 of 3 Based on Passage) Show Passage

» Atomic Structure » De-Broglie's Relationship

MCQ▾

Question

Velocity of helium atom at 300K is 2.40 x 102 meter per sec. What is its wavelength, (mass number of helium is 4)?

Choices

Choice (4) Response
a.

8000 Å

b.

0.83 nm

c.

803 Å

d.

0.416 nm

Question number: 108 (3 of 3 Based on Passage) Show Passage

» Atomic Structure » Quantum Mechanics

MCQ▾

Question

K. E. Of the electron is 4.55×1025J . Calculate the frequency of its wave.

Choices

Choice (4) Response
a.

7.39×109sec1

b.

1.87×103sec1

c.

1.37×109sec1

d.

5.37×1019sec1

Question number: 109

» Organic Compounds With Oxygen » Aldehyde and Ketones » Acidity of Hydrogen

Appeared in Year: 2015

MCQ▾

Question

The correct order of acidity of the following compound is

The compound with benzene: Choice A

The Compound With Benzene: Choice A

Showing the compounds with benzene

The compound with benzene: Choice B

The Compound With Benzene: Choice B

Showing the compounds with benzene

The compound with benzene: Choice C

The Compound With Benzene: Choice C

Showing the compounds with benzene

The compound with benzene: Choice D

The Compound With Benzene: Choice D

Showing the compounds with benzene

Choices

Choice (4) Response
a.

3 > 1 > 2

b.

1 > 2 > 3

c.

3 > 2 > 1

d.

1 > 3 > 2

Question number: 110

» Organic Compounds With Oxygen » Aldehyde and Ketones » Nature of Carbonyl Group

Appeared in Year: 2013

MCQ▾

Question

The molecule having a formyl group is

Choices

Choice (4) Response
a.

Acetone

b.

Acetaldehyde

c.

Acetic acid

d.

Acetic anhydride

Question number: 111

» Basic Concepts in Chemistry » Atomic and Molecular Masses

Appeared in Year: 2015

MCQ▾

Question

The percentage of nitrogen by mass in ammonium sulphate is closest to (atomic masses H = 1, N = 14, 0 = 16, S = 32)

Choices

Choice (4) Response
a.

36%

b.

16%

c.

21%

d.

24%

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