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Effect of Catalyst

A catalyst al...

Question

A catalyst also undergoes changes in its chemical composition when it speeds up or slows down a reaction.

A

True

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B

False

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Solution

The correct option is B
False

A catalyst doesn't undergo changes in its chemical composition when it speeds up or slows down a reaction.

Manganese dioxide acts as a catalyst for the decomposition of potassium chlorate into potassium chloride and oxygen at a lower temperature. But manganese dioxide doesn't undergo any changes in its chemical composition.

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Q. Assertion: Catalysts speed up or slow down a reaction.
Reason: Catalysts change the energy released from a reaction.

Q. Assertion :Catalyst is a substance which takes part in a chemical reaction, undergoes chemical change and alters the rate of a reaction Reason: Catalyst is a substance which does not take part in a chemical reaction, but changes the rate of reaction

Q. After the addition of a catalyst to an exothermic reaction, what happens?
I. The catalyst speeds up the reaction.
II. The catalyst slows down the reaction.
III. The catalyst increases the amount of product formed.

Q. A substance undergoes a change in which its molecules undergo changes. What kind of change is it - physical or chemical?

Q. A catalyst speeds up a chemical reaction by :

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