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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 1461:

The most suitable substance for putting out petrol fire is

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A Water
B Carbon(IV) oxide
C Fire blanket
D Sand

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Question 1462:

The following factors would contribute to environmental pollution except

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A Production of ammonia
B Manufacture of cement
C Photosynthesis
D Combustion

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Question 1463:

The position of equilibrium in a reversible reaction is affected by

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A Particle size of the reactants
B Vigorous stirring of the reaction mixture
C Presence of a catalyst
D Change in concentration of the reactants

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Question 1464:

The diagram above illustrates a conical flask containing water and ice. Which of the following is correct about the diagram?

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A The water is at lower temperature than the ice
B Energy is absorbed when the ice changes to water
C Energy is released when the ice changes to water
D The water molecules vibrate about a fixed point

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Question 1465:

Which of the following statements best explains the difference between a gas and a vapour?

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A Unlike gases, vapours are liquids at room temperature
B Unlike gases, vapour can easily be condensed into liquids
C Unlike gases, vapour is readily converted into solids
D Vapours are generally denser than gases

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