Chemistry Multiple Choice Questions Set – 17

Question 1.

Copper substances when exposed to air gains a green coating due to the formation of:

A. CuO
B. CuCO3 Cu(OH)2
C. CuSO4
D. Cu(NO3)2

Ans: B. CuCO3 Cu(OH)2

Question 2.

Which among the following is used to dilute oxygen in the gas cylinders used by divers ?

A. Krypton
B. Argon
C. Helium
D. Neon

Ans: C. Helium

Question 3.

Which one among the following is not a mixture?

A. Graphite
B. Glass
C. Brass
D. Steel

Ans: A. Graphite

Question 4.

The material used in the manufacture of lead pencil is

A. Graphite
B. Lead
C. Carbon
D. Mica

Ans: A. Graphite

Question 5.

Browning of paper in old books is caused by

A. Frequent use
B. Lack of aeration
C. Collection of dust
D. Oxidation of cellulose

Ans: D. Oxidation of cellulose

Question 6.

Which one element from below list is liquid at room temperature?

A. Zinc
B. Argon
C. Lead
D. Bromine

Ans: D. Bromine

Question 7.

The gas used to dilute oxygen for breathing by deep sea divers is:

A. Neon
B. Argon
C. Nitrogen
D. Helium

Ans: D. Helium

Question 8.

Water can be separated from alcohol water mixture by

A. Decantation
B. Evaporation
C. Distillation
D. Sublimation

Ans: C. Distillation

Question 9.

Catalyst is a substance which

A. Increases the rate of the reaction
B. Decreases the rate of reaction
C. Has no action on the rate of the reaction
D. None of these

Ans: D. None of these

Question 10.

Which among the following elements is found in maximum percentage in the human body ?

A. Carbon
B. Hydrogen
C. Nitrozen
D. Oxygen

Ans: D. Oxygen

Question 11.

The most abundant element in the human body is

A. Carbon
B. Iron
C. Nitrogen
D. Oxygen

Ans: D. Oxygen

Question 12.

In addition to hydrogen, the other abundant element present on Sun’s surface is

A. Helium
B. Neon
C. Argon
D. Oxygen

Ans: A. Helium

Question 13.

When quick lime is added to water

A. Heat is liberated
B. Heat is absorbed
C. Temperature decreases
D. No heat change takes place

Ans: A. Heat is liberated

Question 14.

Iodine can be separated from a mixture of Iodine and Potassium Chloride by

A. Sedimentation
B. Filtration
C. Sublimation
D. Distillation

Ans: C. Sublimation

Question 15.

The most abundant element in the earth’s atmosphere is

A. Argon
B. Nitrogen
C. Oxygen
D. Krypton

Ans: B. Nitrogen

Question 16.

The most abundant element by number in the living system is :

A. Nitrogen
B. Hydrogen
C. Oxygen
D. Carbon

Ans: B. Hydrogen

Question 17.

What is the element that is in the highest percentage in the composition of the earth ?

A. Silicon
B. Oxygen
C. Magnesium
D. Iron

Ans: B. Oxygen

Question 18.

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is:

A. Neon
B. Argon
C. Krypton
D. Helium

Ans: D. Helium

Question 19.

Select the one which is not a mixture :

A. Air
B. Gasoline
D. Distilled water

Ans: D. Distilled water

Question 20.

What is the element required for solar energy conversion ?

A. Beryllium
B. Tantalum
C. Silicon
D. Ultra pure carbon

Ans: C. Silicon

Chemistry GK MCQs all set

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