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Chemistry Class 12
Solutions to CBSE Sample Paper - Chemistry Class 12

Explain how and why will the rate of reaction for a given reaction be affected when

  1. a catalyst is added
  2. the temperature at which the reaction was taking place is decreased



  1. The rate of reaction will increase. The catalyst decreases the activation energy of the reaction therefore the reaction becomes faster.
  2. The rate of reaction will decrease. At lower temperatures the kinetic energy of molecules decreases thereby the collisions decrease resulting in a lowering of rate of reaction.

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.