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Q.

As the reaction proceeds, the rate of a reaction:

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a

decreases

b

remains constant

c

increases

d

depends on the substance

answer is A.

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Detailed Solution

  • The rate of a reaction or speed of reaction for a reactant or product is defined as how fast or slow a reaction takes place.
  • The rate of a reaction decreases as the reaction proceeds because, the concentration of reactants is high at the start and with time, this concentration decreases and the reaction gets slower. 
  • So, the rate of a reaction is dependent on concentration and hence, decreases with the passage of time.
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