Chemical Science MCQs (Chapterwise Multiple Choice Questions)

The mass and wavelength of a moving body is 0.1 mg and 3.31 x 10-29 m respectively. Calculate its kinetic energy. (h = 6.625 x 10-34 J sec)

3 x 10-5 J

2 x 10-3 J

2 x 10-5 J

3 x 10-3 J

Answer & Explanation

Correct Answer: 2 x 10-3 J

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The graph of probability versus distance is:

A curve

None

A straight line

Linear

Answer & Explanation

Correct Answer: A curve

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Which of the following pair of liquids are immiscible?

Acetone + water

Acetic acid + water

Benzene + water

Ethanol + water

Answer & Explanation

Correct Answer: Benzene + water

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The Ebullioscopic constant is 0.516 K kg mol-1. .What is the latent heat of vaporization, if the b.p of water is 100°C.

8100 cal / mol

6200 cal / mol

7900 cal / mol

9700 cal / mol

Answer & Explanation

Correct Answer: 9700 cal / mol

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Calculate the uncertainly in the position of an electron if the uncertainly in its velocity is 5.7 x 105 m/sec. (h = 6.6 x 10-34 kg m2 s-1, mass of electron = 9.1 x 10-31 kg)

None

± 10-10 m

+ 10-10 m

– 10 -10 m

Answer & Explanation

Correct Answer: ± 10-10 m

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The radius for the first excited state (n = 2) orbit is 2.12 Å. Find the Bohr radius for the hydrogen atom (n = 1) in A.

2.271

0.700

0.530

1.530

Answer & Explanation

Correct Answer: 0.530

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The boiling point of Benzene, Ethanol, Octane and Pentane are 80°C, 78°C, 126°C and 36°C respectively. Which of the following will show highest vapour pressure at room temperature.

Benzene

Pentane

Entahol

Octane

Answer & Explanation

Correct Answer: Pentane

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……….. among the following has maximum number of unpaired electrons.

Cu+

Zn

Fe2+

Ni3+

Answer & Explanation

Correct Answer: Fe2+

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What is the vapour pressure of pure liquid A at 27°C if it forms an ideal solution with another liquid B, the vapour pressure and mole fraction of pure liquid B at 27°C is 140 torr and 0.2 respectively. The total vapour pressure of the solution is 84 torr at 27°C.

140 torr

17 torr

70 torr

56 torr

Answer & Explanation

Correct Answer: 70 torr

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De-Broglie equation applies to:

Neutrons only

Electrons only

Protons only

All the material objects in motion

Answer & Explanation

Correct Answer: All the material objects in motion

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MCQ on Basic Chemical Science	MCQ on Colligative Properties
MCQ on Nuclear Chemistry	General Chemical Science MCQs