Waec Chemistry 1988 Past Questions and Answers

Question 21:

• WAEC 1988

Bubbling of carbon (IV)oxide into calcium hydroxide solution results in the formation of

A. CaCO₃
B. CuCO₃
C. ZnCO,sub>3
D. Na₂CO₃
E. MgCO₃

Question 22:

• WAEC 1988

Which of the following is not decomposed by heat?

A. CaCO₃
B. CuCO₃
C. ZnCO,sub>3
D. Na₂CO₃
E. MgCO₃

Question 23:

• WAEC 1988

Which of the following is not true of the rusting of iron?

A. Rusting is a reduction process
B. Rusting of iron takes place in the presence of oxygen and moisture
C. The rust formed is reddish brown
D. The major constituent of rust is hydrated iron (lll) oxide
E. Rusting is similar to burning

Question 24:

• WAEC 1988

Which of the following is not true of the rusting of iron?

A. Rusting is a reduction process
B. Rusting of iron takes place in the presence of oxygen and moisture
C. The rust formed is reddish brown
D. The major constituent of rust is hydrated iron (lll) oxide
E. Rusting is similar to burning

Question 25:

• WAEC 1988

What volume of oxygen will be left unreacted when a mixture of 100cm³ of hydrogen and 200cm,sup>3,/sup> of oxygen are exploded in a eudiometer?

A. 300cm³
B. 200cm³
C. 150cm³
D. 100cm³
E. 50cm³