NTPC CBT-2 Chemistry Quiz

Question 1:

What is the maximum number of electrons that can be accommodated in the K shell of an atom?

8

18

2

6

Question 2:

Which of the following method is used for the separation of alum crystals from impure samples ?

Crystallization

Centrifugation

Evaporation

Chromatography

Question 3:

Which of the following pairs are the example of isotones?

C¹³ , N¹⁴

H³ , He⁴

Both 1 and 2

None of these

Question 4:

Which one of the following is termed as 'Dry ice'?

Ice present in ice-cream

Solid water at Antarctica

Solid state of carbon dioxide

Solid water of ionosphere

Question 5:

What was the drawback of Rutherford model of an atom?

Rutherford did not specify the number of orbits
Rutherford did not specify the number of electrons in each orbit
He was failed to explain the stability of an atom
He state that all the mass of an atom is concentrated in the nucleus of an atom

1,2,3

2,3,4

1,2,4

1,2,3,4

Question 6:

The formation of ozone hole in the Antarctica region has been a cause of concern . What could be the reason for the formation of this hole ?

Presence of prominent tropospheric turbulence

Presence of proper polar stratospheric clouds

Increased temperature at polar region due to global warming

Absence of polar front and stratospheric clouds

Question 7:

Which one of the following is used in soda – acid fire extinguisher ?

Sodium chloride

Sodium hydrogen carbonate

Calcium hydroxide

Acetic Acid

Question 8:

Liquid ammonia bottle is cooled before opening the seal because-

Sudden increase in pressure decrease the volume

No change on volume

Large amount of heat is released

Sudden decrease in pressure increases the volume

Question 9:

Methanol is a poison because

It oxidized to methanol in the liver of a person

It oxidized to methanoic acid in the kidney of a person

It oxidized to methanal in the liver of a person

None of these

Question 10:

Steam cause more burns than water at 373 K temperature because

Particle in steam has more latent heat of vaporization than particles in water at 373 K temperature.

Particle in steam has less latent heat of vaporization than particles in water at 373 K temperature

Particle in steam has more latent heat of fusion than particles in water at 373 K temperature

Particle in steam has less latent heat of fusion than particles in water at 373 K temperature

NTPC CBT-2 Chemistry Quiz - 65

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NTPC CBT-2 Chemistry Quiz - 65

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