Jamb Chemistry Past Questions and Answers

Question 191:

• JAMB 1980

If one of the following oxides is heated with hydrogen or carbon using a bunsen burner, it is not reduced to the metal. Which one is it?

A. Lead oxide
B. Magnesium oxide
C. Copper oxide
D. Tin oxide
E. Iron oxide

Question 192:

• JAMB 1980

Which of the following statement is false?

A. Acids react with some metals, liberating hydrogen
B. Acids react with carbonates, liberating carbondioxide
C. Acids conduct electricity and are decomposed by the current, liberating hydrogen at the anode
D. Acids have a sour taste
E. Acids change the colour of indicators

Question 193:

• JAMB 1980

A mixture of ethanol, sodium dichromate, and water is allowed to drop gradually into a boiling solution containing one part concentrated H₂SO₄ and the liberate gas is collected by cooling it with ice water to give a liquid. This liquid is?

A. Ethanoic acid
B. Acetaldehyde
C. Ethyl acetate
D. Methanol
E. Ethylene

Question 194:

• JAMB 1980

When chlorine gas is passed into a solution of sulphur dioxide?

A. Sulphur dioxide is reduced to sulphur
B. The chlorine is oxidized to hydrochloric acid
C. Dilute sulphuric acid and hydrochloric acid are produced
D. Hydrochloric acid and sulphur are produced
E. Sulphur trioxide is the only product

Question 195:

• JAMB 1980

In the above experiment X is

A. Pure nitrogen
B. A mixture of nitrogen and oxygen
C. A mixture of nitrogen and carbondioxide
D. A mixture of oxygen and inert gases
E. A mixture of nitrogen and inert gases