WAEC Chemistry Past Questions, Answers, And Explanations - Chemistry

Waec Chemistry Questions

Question 201:

WAEC 1992

Study carefully the reaction represented by the equation below. 2H₂O ₂_(l) â†’ O ₂_(g) + 2H₂O_(l). Which of the following will not reaction increase the reaction rate?

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A Heating the hydrogen peroxide
B Adding a pinch of MnO₂ to the reactant
C Increasing the concentration of the H₂O₂
D Adding water to the reactant
E Exposing the reactant to sunlight

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Question 202:

WAEC 1992

Which of the following processes is a physical reaction?

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A Electrolysis
B Hydrolysis
C Allotropic change
D Neutralization
E Corrosion

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Question 203:

WAEC 1992

If the volume of a given mass of gas at 298 K and pressure of 205.2 x 10³ Nm-² is 2.12dm³, what is volume of the gas at s.t.p? (Standard pressure = 101.3 x 10³ Nm-₂, Standard temperature = 273K)

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