Jamb Chemistry 1991 Past Questions and Answers

Question 1:

• JAMB 1991

Which of the following can be obtained by fractional distillation?

A. Nitrogen from liquid air
B. Sodium chloride from sea water
C. Iodine from a solution of Iondine in carbon tetrachloride
D. Sulphur from a solution of sulphur incarbon disulphide

Question 2:

• JAMB 1991

Which of the following can be obtained by fractional distillation?

A. Nitrogen from liquid air
B. Sodium chloride from sea water
C. Iodine from a solution of Iondine in carbon tetrachloride
D. Sulphur from a solution of sulphur incarbon disulphide

Question 3:

• JAMB 1991

Which of the following are mixtures?
i, Petroleum
ii, Rubber latex
iii. Vulcanizer's solution
iv, Carbon (II)sulphide

A. I, ii and iii
B. I, ii and iv
C. I and ii only
D. I and iv

Question 4:

• JAMB 1991

An iron ore is known to contain 70.0% Fe₂O₃. The obtain from 80kg of the ore is?
(Fe = 56, O = 16)

A. 35.0 kg
B. 39.2 kg
C. 70.0 kg
D. 78.4 kg

Question 5:

• JAMB 1991

In two separate experiments, 0.36g and 0.71g of chlorine combined with a metal X to give Y and Z respectively. An analysis showed that Y and Z contain 0.20g and 0.40g of X respectively. The data above represents the law of ?

A. Multiple proportion
B. Conservation of mass
C. Constant composition
D. Reciprocal proportion