Chemistry
What are positive and negative catalysts ? Give one example of each.
Chemical Reaction
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Answer
Positive catalyst : When a catalyst increases the rate of a chemical reaction, it is known as a positive catalyst.
Example — Finely divided iron is used as a positive catalyst in the manufacture of ammonia from hydrogen and nitrogen.
Negative catalyst : When a substance decreases the rate of a chemical reaction, it is known as a negative catalyst or inhibitor.
Example — Phosphoric acid acts as a negative catalyst to decrease the rate of decomposition of hydrogen peroxide.
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