Jamb Chemistry 2019 Past Questions and Answers

Question 41:

• JAMB 2019

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 42:

• JAMB 2019

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 43:

• JAMB 2019

200cm³ each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.
[Pb = 207, Cl= 35.5, N = 14, O = 16]

A. 2.78g
B. 5.56g
C. 8.34g
D. 11.12g
E. 16.45g

Question 44:

• JAMB 2019

56.00cm³ of a gas at S.T.P. weighed 0.11g. What is the vapour density of the gas?
[Molar volume of a gas at S.T.P = 22.4dm³

A. 11.00
B. 22.00
C. 33.00
D. 44.00
E. 55.00

Question 45:

• JAMB 2019

Which of the following gases will diffuse fastest when passed through a porous plug?
[H = 1, C = 12, N = 14, O = 16]

A. Propane
B. Oxygen
C. Methane
D. Ammonia