Jamb Chemistry 1981 Past Questions and Answers

Question 31:

• JAMB 1981

If 48,000 coulombs of electricity are required to discharge 0.5 mole of sodium from a molten sodium chloride mass, then the number of coulombs required to discharge 2 moles of lead from molten lead (ll) chloride is?

A. 48,000
B. 96,000
C. 192,000
D. 384,000
E. 576,000

Question 32:

• JAMB 1981

The following compounds are given with their corresponding boiling points.
Compound Boiling Point
i.................................14°C
ii................................24°C
iii................................0°C
iv................................120°C
V.................................-2°C
From the above information, indicate which of the following is correct?

A. All the compounds are gaseous at 20 °C
B. One of the compounds is gaseous at 20 °C
C. Two of the compounds are gaseous at 20 °C
D. Three of the compounds are gaseous at 20 °C
E. None of the compounds is gaseous at 20 °C

Question 33:

• JAMB 1981

The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?

A. Na₂SO₄ + SO₂ + O₂ + H₂O
B. Na₂SO₃ + SO₃ + O₂ + H₂O
C. Na₂SO₄ + SO₂ + S + H₂O
D. Na₂SO₄ + SO₃ + S + H₂O
E. Na₂SO₄ + SO₂ + H₂O only

Question 34:

• JAMB 1981

Which of the following is NOT a true statement of the kinetic Theory of Gases?

A. The molecules move at random
B. The size of molecules is negligble as compared with the volume of gas
C. The molecular collisions are perfectly elastic
D. Every molecule has the same kinetic energy at a particular temperature
E. The average kinetic energy is proportional to the absolute temperature of the gas

Question 35:

• JAMB 1981

The electronic configuration of elements X and Y are X = 2, 8, 6; Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be?

A. Ionic
B. Covalent
C. Dative covalent
D. Metallic
E. None of the above