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Which of the following decreases the rate of reactions?

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in Chemistry – Class 12 by (188k points)
Which of the following decreases the rate of reactions?

(a) Catalytic promoters

(b) Homogeneous catalyst

(c) Catalytic poison

(d) Heterogeneous catalyst

I had been asked this question in quiz.

I'm obligated to ask this question of Surface Chemistry in section Surface Chemistry of Chemistry – Class 12

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Best answer
Right option is (c) Catalytic poison

The best explanation: A catalytic poison is a substance which destroys the activity of the catalyst even if it is present in trace amounts. Eg: In the manufacture of sulphuric acid by contact process, any arsenic impurity present in the reacting gases will destroy the activity of vanadium pentoxide catalyst.

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