Question

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

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
• B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
• C. Assertion is true but Reason is false
  
• D. Assertion is false but Reason is true
• E. Both Assertion and Reason are false

Answer 1

The correct option is C Assertion is true but Reason is false

Answer(C)

(i) Positive catalysts: A catalyst which increases the rate of reaction is called positive catalyst. Such catalyst decreases activation energy by accepting a smaller path, so rate of reaction is increased.

(ii) Negative catalysts (Inhibitors):A catalyst which decreases or retards the rate of reaction is called negative catalysts.

so Catalysts speed up or slow down a reaction,this statement is true.

Catalysts does not change the energy released from a reaction. it only provides an alternative path for reaction,so statement 2 is not true.