WAEC - Chemistry (1992 - No. 4)
Study carefully the reaction represented by the equation below. 2H2O 2(l) → O 2(g) + 2H2O(l). Which of the following will not reaction increase the reaction rate?
Heating the hydrogen peroxide
Adding a pinch of MnO2 to the reactant
increasing the concentration of the H2O2
Adding water to the reactant
Exposing the reactant to sunlight
Explanation
Reaction of decomposition of hydrogen peroxide is very slow in moderate temperatures without the presence of a catalyst.
It can be sped up by increasing the temperature, which triggers the reaction of thermal decomposition.
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