Waec Chemistry 1993 Past Questions and Answers

Question 6:

• WAEC 1993

Trioxosulphate (lV) acid is not stored for a long period because it

A. Is a weak dibasic acid
B. Has bleaching properties
C. Is unstable and eaily decomposed
D. Smells strongly of sulphur (lV) oxide
E. Can act as a germicide

Question 7:

• WAEC 1993

Alkanes are used mainly

A. In the production of plastics
B. As domestic and industrial fuels
C. In the textile industry
D. In the hydrogenation of oils
E. As fine chemicals

Question 8:

• WAEC 1993

Which of the following pairs illustrates isotopy?

A. But-l-ene and but -2-ene
B. Ortho-hydrogen and parahydrogen
C. Oxygen and ozone
D. Hydrogen and deuterium
E. Alpha-particle and beta-particle

Question 9:

• WAEC 1993

Carbon is often deposited in the exhaust-pipe of cars because of the

A. Presence of carbon in petrol
B. Dehydrogenation of petrol
C. Incomplete combustion of petrol
D. Presence of additives in petrol
E. Contamination of petrol with diesel

Question 10:

• WAEC 1993

What does X atand for in the following expression? X = Log₍₁₀₎(H⁺)

A. Enthalpy change (∆H)
B. Equilibrium constant (K)
C. Solubility product
D. Degree of acidity (pH)
E. Lonic product of water