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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 11:

Which of the following does not affect the rate of a chemical reaction?

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A Addition or presence of a catalyst
B Size of the reacting particles
C The enthalpy change for the reaction
D Concentration of the reactants
E Temperatureat which the reaction is carried out

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Question 12:

Which of the following does not affect the rate of a chemical reaction?

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A Addition or presence of a catalyst
B Size of the reacting particles
C The enthalpy change for the reaction
D Concentration of the reactants
E Temperatureat which the reaction is carried out

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Question 13:

Given that 32.0g sulphur contains 6.02 x 10 23 sulphur atoms how many atoms are there in 2.70g of aluminium? {Al = 27, S =32}

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A 6.02 x 10 ²³
B 3.01 x 10²²
C 6.02 x 10²²
D 5. 08 x 10²²
E 3.01 x 10²²

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Question 14:

The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is

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A CH₂
B CH₃
C C₂H₂
D C₂H₄
E C₂H₆

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Question 15:

A salt which loses mass when exposed to air is

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A Hygroscopic
B Deliquescent
C Efflorescent
D Fluorescent
E Effervescent

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