Chemistry 1978 Jamb Past Questions and Answers

Question 41 :

• 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 42 :

• 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 43 :

• 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

Question 44 :

• JAMB 1978

Which of the five atoms can be described by the following properties: Relative atomic mass is greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in solution?

A. T
B. W
C. X
D. Y
E. Z

Question 45 :

• JAMB 1978

A solid X when heated gives off a brown gas. If X is soluble in excess sodium hydroxide solution but insoluble in excess ammonium hydroxide solution, then X is

A. Basic lead carbonate
B. Lead (II) nitrate
C. Sodium carbonate
D. Zinc nitrate
E. Sodium nitrate