Waec Chemistry 1991 Past Questions and Answers

Question 31:

• WAEC 1991

When a crystal was added to its solution, it did not dissolve and the solution remained unchanged, showing that the solution was

A. Concentrated
B. Supersaturated
C. Unsaturated
D. Colloidal
E. Saturated

Question 32:

• WAEC 1991

An organic compound which reacts readily with bromine to form a compound with the formula CH₃CHBrCH₂Br is

A. Ethene
B. Propane
C. Butane
D. Propene
E. Propyne

Question 33:

• WAEC 1991

river contaminated by alkali waste will have a pH of about.

A. 1
B. 3
C. 5
D. 7
E. 9

Question 34:

• WAEC 1991

In solution, aminoethanoic acid (glycine) can be represented as NH⁺₃ CH₂COO. This implies that it

A. Is soluble in all inorganic liquids
B. Can function as a weak acid or a weak base
C. Does not form salt with mineral acids
D. Is highly acidic
E. Cannot form esters with alkanols

Question 35:

• WAEC 1991

Hydrogen is used for the following except

A. Manufacturing of ammonia
B. Synthesis of hydrochloric acid
C. Extinguishing fire
D. Conversion of coal to petrol
E. Manufacture of margarine