Jamb Chemistry 1993 Past Questions and Answers

Question 1:

• JAMB 1993

Which of the following substances is a mixture?

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

Question 2:

• JAMB 1993

Which of the following substances is a mixture?

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

Question 3:

• JAMB 1993

A balanced chemical equation obeys the law of?

A. Conservation of mass
B. Difinite proportions
C. Multiple proportions
D. Conservation of energy

Question 4:

• JAMB 1993

How many moles of oxygen molecules would be produced from the decomposition of 2.50 moles of potassium trioxochlorate (V)?

A. 2.50
B. 3.50
C. 3.75
D. 7.50

Question 5:

• JAMB 1993

For iodine crystals to sublime on heating, the molecules must acquire energy that is?

A. Less than the forces odf attraction in the solid
B. Equal to the forces of attraction in th solid
C. Necessary to melt the solid
D. Greater than the forces of attraction in both the solid and the liquid phases