Waec Chemistry 1996 Past Questions and Answers

Question 21:

• WAEC 1996

When acidified KMnO₄ solution is decolorised by ethene, the gas acts as

A. A straight-chain hydrocarbon
B. A saturated hydrocarbon
C. A reducing agent
D. A dehydrating agent
E. An oxidizing agent

Question 22:

• WAEC 1996

What amount of hydrogen will be required for complete hydrogenation of one mole of pent-3-yne?

A. 1 mole
B. 2 moles
C. 3 moles
D. 5 moles
E. 6 moles

Question 23:

• WAEC 1996

When excess carbon (lV) oxide is passed into lime water, the turbidity produced initially disappears due to the formation of

A. Calcium oxide
B. Calcium carbide
C. Calcium hydrogentrioxocarbonate (IV)
D. Trioxocarbonate (IV) acid
E. Calcium trioxocarbonate (IV)

Question 24:

• WAEC 1996

Which of the following is a disaccharide?

A. Fructose
B. Starch
C. Cellulose
D. Sucrose
E. Glycogen

Question 25:

• 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. Compound X was probably

A. Rubber
B. Polyethene
C. Nylon
D. Cellulose
E. Ethanol