Q.

For an elementary reaction, 2 A+BC+D, the active mass of B is kept constant but that of A is tripled. The rate of reaction will
 

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a

increase by 9 times
 

b

increase by 3 times
 

c

decrease by 6 times

d

decrease by 3 times
 

answer is B.

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Detailed Solution

  • According to the given reaction, Rate =k[A]2[B]1
    When A becomes 3 A i.e. triples, the rate will become: 
  • Rate =k[3A]2[ B]1=9k[A]2[ B]
    Thus, rate of reaction is increased by 9 times.
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