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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 1441:

Which of the following organic compounds can undergo both addition and substitution reactions?

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A Pentane
B Benzene
C Propane
D Hexane

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Question 1442:

Which of the following equations represents a redox reaction?

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A \(HNO_{{3}{(aq)}} + NaOH_{(aq)} \to NaNO_{{3}{(aq)}} + H_{2}O_{(l)}\)
B \(AgNO_{{3}{(aq)}}+KCl_{(aq)} \to AgCl_{(s)}+KNO_{{3}{(aq)}}\)
C \(CaCO_{{3}{(s)}} \to CaO_{(s)} + CO_{{2}{(g)}}\)
D \(2H_{2}S_{(s)} + SO_{{2}{(g)}} \to 2HO_{2} + 3S_{(g)}\)

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Question 1443:

The process of extraction of iron from its ore is

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A Decomposition
B Oxidation
C Reduction
D Sublimation

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Question 1444:

What is the solubility of a salt if 0.4g of it is obtained on evaporating 200\(cm^{3}\) of its saturated solution to dryness?

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A 0.08\(gdm^{-3}\)
B 2.00\(gdm^{-3}\)
C 8.00\(gdm^{-3}\)
D 80.00\(gdm^{-3}\)

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Question 1445:

An acidic salt has

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A Double anions in its aqueous solution
B A single cation in its aqueous solution
C Hydrogen ions in its aqueous solution
D Hydrogen atoms in its aqueous solution

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