Chemistry 1993 Jamb Past Questions and Answers

Question 36 :

• JAMB 1993

Palm wine turns sour with time because?

A. The sugar content is converted into alcohol
B. The carbon (IV) oxide formed during the fermentation process has a sour taste
C. It is commonly adulterated by the tappers and sellers
D. Microbial activity results in the production of orgain acids within it

Question 37 :

• JAMB 1993

Catalytic hydrogenation of benzene produces?

A. An aromatic hydrocarbon
B. Margarine
C. Cyclohexane
D. D.D.T

Question 38 :

• JAMB 1993

Which of the following represents saponification?

A. Reaction of carboxylic acids with sodium hydroxide
B. Reaction of alkanoates with acid
C. Reaction of alkanoates with alcohols
D. Reaction of alkanoates with sodium hydroxide

Question 39 :

• JAMB 1993

The confirmatory test for alkanoic acids in organic qualitative analysis is the?

A. Turning of wet blue litmus paper red
B. Reaction with alkanols to form esters
C. Reaction with sodium hydroxide to form salt and water
D. Reaction with aqueous Na₂COsp₃ to liberate a gas which turns lime water milky

Question 40 :

• JAMB 1993

A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?

A. Sulphur (ii) oxide
B. Hydrogen sulphide
C. Sulphide (lV) oxide
D. Hydrogen chloride