Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 66:

• JAMB 1992

Which of the following are isomers?

A. Ethanol and dimethyl ether
B. Benzene and methybenzene
C. Ethanol and propanone
D. Trichloromethane and tetrachloromethane

Question 67:

• JAMB 1993

Which of these gases can be dried with concentrated H2SO4?

A. HBr
B. H₂S
C. NH₃
D. SO₂

Question 68:

• JAMB 1993

When dilute aqueous solutions of lead (II) nitrate and potassium bromide are mixed, a precipitate is observed.
The products of this reaction are?

A. PbO_(s) + Br^- + KNO₃
B. Br₂ + NO_2(g) + PbBr_2(s)
C. PbO_(s) + K⁺_(aq) + Br_(aq) + NO_2(g)
D. PbBr_2(s) + K_(aq) + K⁺_(aq) + NO_3(aq)

Question 69:

• JAMB 1993

The fraction of crude oil used as jet fuel is?

A. Refinery gas
B. Diesel oil
C. Kerosene
D. Gasoline

Question 70:

• JAMB 1993

It is not desirable to use lead tetraethyl as an anti-knock agent because?

A. It is expensive
B. Of pollution effects from the exhaust fumes
C. It lowers the octane rating of petrol
D. It is explosive