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

Question 31:

• JAMB 1990

Which of the following is a physical change?

A. The bubbling of chlorine into water
B. The bubbling of chlorine into a jar contanining hydrogen
C. The dissolution of sodium chloride in water
D. The passing of steam over heated iron

Question 32:

• JAMB 1990

Which of the following is a physical change?

A. The bubbling of chlorine into water
B. The bubbling of chlorine into a jar contanining hydrogen
C. The dissolution of sodium chloride in water
D. The passing of steam over heated iron

Question 33:

• JAMB 1992

There is a large temperature interval between the melting point and the boiling point of a metal because?

A. Metals have very high melting points
B. Metals conduct heat very repaidly
C. Melting does not break the metalic bond but boiling does
D. The crystal lattice of metals is easily broken

Question 34:

• JAMB 1992

There is a large temperature interval between the melting point and the boiling point of a metal because?

A. Metals have very high melting points
B. Metals conduct heat very repaidly
C. Melting does not break the metalic bond but boiling does
D. The crystal lattice of metals is easily broken

Question 35:

• JAMB 1993

Which of the following substances is a mixture?

A. Sulphur powder
B. Bronze
C. Distilled water
D. Ethanol