Chemistry MCQs

Question 1

Which of the following is secondary air pollutant ?

Accepted Answer

SO 2

Answer

Photochemical smog

Answer

NO 2

Answer

Dust particles

Question 2

The maximum number of isomers for an alkene with molecular formula C 4 H 8 is

Accepted Answer

4

Answer

5

Answer

2

Answer

3

Question 3

Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful

Accepted Answer

Solar ultraviolet radiation

Answer

Solar infrared radiation

Answer

CO 2 in the air

Answer

SO 2 in the air

Question 4

The pollutant responsible for ozone holes is ________

Accepted Answer

CFC

Answer

CO 2

Answer

SO 2

Answer

CO

Question 5

Man dies in the atmosphere of CO, because it

Accepted Answer

Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O 2

Answer

Dries up the blood

Answer

Combines with O 2 present in the body

Answer

Reduces the organic matter of tissues

Question 6

Which substance is used to retard the setting action of cement?

Accepted Answer

CaSO 4 .2H 2 O

Answer

CaO

Answer

Al 2 O 3

Answer

Na 2 O + K 2 O

Question 7

What are the number of moles of CO 2 which contains 16 g of oxygen?

Accepted Answer

0.5 mole

Answer

0.2 mole

Answer

0.4 mole

Answer

0.25 mole

Question 8

Pollutant from motor car exhaust that causes mental disease is

Accepted Answer

Lead

Answer

NO 2

Answer

SO 2

Answer

Hg

Question 9

Main pollutant present in automobile exhaust is

Accepted Answer

CO

Answer

CO 2

Answer

NO

Answer

Hydrocarbons