Waec Chemistry Past Questions and Answers

Question 26:

• WAEC 1988

Which of the following is not decomposed by heat?

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

Question 27:

• 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 28:

• 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 29:

• 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

Question 30:

• WAEC 1988

How many isomers can be obtained from C_4H[sub]10?
[/sub]

A. O
B. 1
C. 2
D. 3
E. 4