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Q.

A catalyst increases the rate of reaction because it?

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a

Increases the activation energy

b

Decreases the activation energy

c

Decreases collision diameter

d

Increases the temperature coefficient 

answer is B.

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Detailed Solution

The presence of a catalyst increases the reaction rate by providing an alternative pathway with lower activation energy. If activation energy is lowered then more reactants will come across that barrier easily and the rate of reaction will increase.
  
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