Separation of mixtures and purification of chemical substances - Jamb Chemistry Past Questions and Answers

Question 101:

• JAMB 2015

The filter in the cigarette reduce the nicotine construct by

A. Burning
B. Adsorption
C. Evaporation
D. Absorption

Question 102:

• JAMB 2015

A difference between chemical and physical change is that in a chemical change

A. Oxygen is consumed
B. Heat is supplied
C. The reversible process occurs
D. A new substance is formed

Question 103:

• JAMB 2015

Two equal bulbs, one containing ammonia and the other one opened mouth-to mouth to each other at temperature the entropy in the mixture of gases is likely to

A. Remain unchanged
B. Increase
C. Decrease
D. Charge

Question 104:

• JAMB 2016

The principle of column chromatography is based on th ability of the constituents to

A. React with the solvent in the column
B. React with each other in the solvent in the column
C. Dissolve in each other in the column
D. Move at different speeds in the column

Question 105:

• JAMB 2016

Ammonium chloride can be separated from its mixture with common salt by

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