Jamb Chemistry Past Questions and Answers

Question 446:

• JAMB 1985

The boiling point of water, ethanol, toluene and butan-2-ol are 373.0k, 351.3k, 383.6k and 372.5k respectively. Which liquid has the highest vapour pressure at 323.0k?

A. Water
B. Toluene
C. Ethanol
D. Butan-2-ol
E. None

Question 447:

• JAMB 1985

In what respect will two dry samples of nitrogen gas differ from each other if sample 1 is prepared by completely removing CO₂ and O₂ from air, and sample 2 is prepared by passing purified nitrogen(i)oxide over heated copper? sample 1 is

A. Purer than sample 2
B. Slightly denser than sample 2
C. In all respects the same as sample 2
D. Colourless but sample 2 has a light brown colour
E. Slightly less reactive than sample 2

Question 448:

• JAMB 1986

Which of the following salts when dissolved in water will NOT give the corresponding pH value?

A. NaHSO₄, pH < 5
B. Na₂CO₃, pH > 8
C. Na₂Cl,pH = 7
D. NaHCO, pH < 6

Question 449:

• JAMB 1986

Which of the following salts when dissolved in water will NOT give the corresponding pH value?

A. NaHSO₄, pH < 5
B. Na₂CO₃, pH > 8
C. Na₂Cl,pH = 7
D. NaHCO, pH < 6

Question 450:

• JAMB 1986

Which of the following is an acidic salt?

A. NaHSO₄
B. Na₂SO₄
C. CH₃CO₂Na
D. Na₂S