Jamb Chemistry Past Questions and Answers

Question 101:

• JAMB 1978

By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and

A. Potassium nitrate
B. Sand
C. Lead nitrate
D. Sugar (glucose)
E. Starch

Question 102:

• JAMB 1978

In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?

A. In the beaker
B. In the conical flask
C. In a burette
D. In the standard flask
E. In the measuring cylinder

Question 103:

• JAMB 1978

A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because

A. Pressure inside the gas jar is greater than pressure outside it
B. The air in the gas jar had been used up by burning
C. Oxygen in the gas jar had been used up by burning
D. Nitrogen in the gas jar had been used up by burning
E. The temperature in the jar had risen considerably

Question 104:

• JAMB 1978

You are provided with five gas jars containing SO₂, CO₂, H₂, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely

A. Pass each gas into lime water
B. Pass each gas into water and test with litmus paper
C. Pass each gas into concentrated sulphuric acid
D. Expose each gas to atmospheric air
E. Expose each gas to fumes of hydrogen chloride

Question 105:

• JAMB 1978

Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?

A. Litmus paper
B. Phenolphthalein
C. Methyl orange
D. Universal indicator
E. None of these