Waec Chemistry 1996 Past Questions and Answers

Question 26:

• WAEC 1996

Use this following information to answer this question. Compound X was boiled with concentrated hydrochloric acid for a long time. One of the products was found to be a sugar. What type of reaction was involved between compound X and concentrated hydrochloric acid?

A. Polymerization
B. Fermentation
C. Hydrolysis
D. Neutralization
E. Esterification

Question 27:

• WAEC 1996

The component of air that can be removed by alkaline pyrogallol solution is

A. Oxygen
B. Nitrogen
C. Water vapour
D. Carbon (IV) oxide
E. Noble gases

Question 28:

• WAEC 1996

During water treatment for town supply, water is passed through layers of send beds in order to

A. Soften the water
B. Filter the water
C. Decolorize the water
D. Destroy the germs in the water
E. Coagulate colloidal particles in the water

Question 29:

• WAEC 1996

The cleansing action of soap in hard water is not satisfactory because soap

A. Forms insoluble calcium and magnesium salts
B. Is made from fats and oils
C. Has an organic component
D. Alters the surface tension of water
E. Is a sodium salt of higher carboxylic acids

Question 30:

• WAEC 1996

What is the role of MnO₂ in the reaction represented by the following equation?MnO₂ + 4HCI₂ + CI₂ + 2H₂O

A. Bleaching agent
B. Oxidizing agent
C. Amphoteric oxide
D. Basic oxide
E. Catalyst