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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 26:

Which of the following is not decomposed by heat?

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

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Question 27:

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

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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

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Question 28:

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

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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

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Question 29:

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?

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

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Question 30:

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

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A O
B 1
C 2
D 3
E 4

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