Jamb Chemistry 1985 Past Questions and Answers

Question 46:

• JAMB 1985

Hydrogen is not liberated when trioxonitrate(v)acid reacts with zinc because

A. Zinx is not rendered passive by acid
B. Hydrogen produced is oxidized to water
C. Oxides of nitrogen are produced
D. All nitrates are soluble in water
E. Trioxonitrate(v)acid is a strong acid

Question 47:

• 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 48:

• 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