Chemistry MCQs

Question 1

The presence of ozone in the stratosphere is responsible for

Accepted Answer

Checking the penetration of ultraviolet rays to the earth

Answer

Increasing the average global temperature in recent years

Answer

Higher rate of photosynthesis

Answer

Supplying oxygen for people travelling in jets

Question 2

The major use of sulphur is in the manufacture of

Accepted Answer

H2SO4

Answer

H2S

Answer

SO2

Answer

Fungicide

Question 3

Percentage of lead in lead pencils is

Accepted Answer

0

Answer

31-66

Answer

40

Answer

80

Question 4

0.01 mole of NaOH is added to 10 liters of water. The pH of water changes by

Accepted Answer

4

Answer

3

Answer

6

Answer

7

Question 5

Which of the following methods is used in determining the number average molar mass of a macromolecule?

Accepted Answer

Osmotic pressure

Answer

Viscosity

Answer

Sedimentation equilibrium

Answer

Light scattering

Question 6

Molality of pure water is

Accepted Answer

55.5

Answer

18

Answer

1.8

Answer

5.55

Question 7

A solution is

Accepted Answer

A homogeneous mixture of two or more substances

Answer

A solid dissolved in a liquid

Answer

A solid dissolved i water

Answer

A mixture of two liquids

Question 8

Which one is the most dense liquid from the below?

Accepted Answer

Choloform

Answer

Water

Answer

Gasolin

Answer

None of the above

Question 9

Which of the following partially miscible liquid pairs has both lower and upper critical solution temperature?

Accepted Answer

Glycerine and m-toluene

Answer

Water and Phenol

Answer

Aniline and n-hexane

Answer

Water and diethyl aniline