Boiling and melting points - Jamb Chemistry Past Questions and Answers

Question 6:

• 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 7:

• 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 8:

• JAMB 1994

A pure solid usually melts?

A. Over a wide range of temperature
B. Over a narrow range of temperature
C. At a lower temperature than the impure one
D. At the same temperature as the impure one

Question 9:

• JAMB 1998

A solid begins to melt when?

A. Constituent particles acquires a greater kinetic energy
B. Energy of vibration of particles of the solid is less than the intermolecular forces
C. Constituent particles acquires energy above the average kinetic energy
D. Energy of vibration of particles of the solid equals the intermolecular forces

Question 10:

• JAMB 2001

Use the graph above to answer this question.How long does it take all the solid to melt?`

A. 2.5 mins
B. 6.0 mins
C. 1.0 min
D. 3.0 mins