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According to the collision theory of chemical reactions
  • A chemical reaction occurs with every molecular collision
  • Rate is directly proportional to the number of collisions per second
  • Reactions in the gas phase are always of zero order
  • Reaction rates are of the order of molecuar speeds


B.

Rate is directly proportional to the number of collisions per second
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For the reaction aA+bBmM+nN-dAdt is equal to

  • -dBdt
  • am-dMdt
  • -ba-dBdt
  • -1bdBdt

B.

am-dMdt
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In which of the following cases, does the reaction go farthest to completion
  • k = 102
  • k = 10–2
  • k = 10
  • k = 1

A.

k = 102
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For the reaction A B, the rate of reaction becomes twenty seven times when the concentration of A is increased three times.
What is the order of the reaction?

r= k[A]n =Kan
When concentration is increased three time [ A] =3a 
therefore,

27rr = K[3a]nKan Or  27 = 3nn33 =3nn=3

Order = 3.

 
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What will be the order of reaction if doubling of the concentration of a reactant increases the rate by a factor of 4 and trebling the concentration of the reactant by factor of 9?
  • first order
  • zero order
  • second order
  • third order

C.

second order
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