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Question

i)2H2O2Pt2H2O +O2ii)2H2O2 −−−Glycerol2H2O +O2
What is the role of Pt and glycerol in the above reaction?

A
Both act as negative catalysts
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B
Both act as positive catalysts
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C
Pt acts as a negative catalyst and glycerol acts as a positive catalyst
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D
Pt acts as a positive catalyst and glycerol acts as a negative catalyst
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Solution

The correct option is D Pt acts as a positive catalyst and glycerol acts as a negative catalyst
In reaction i), platinum acts as a catalyst and accelerates the decomposition of hydrogen peroxide, so it is a positive catalyst.
In reaction ii), the decomposition of hydrogen peroxide is suppressed by adding glycerol to the solution. Here glycerol acts as a negative catalyst.

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