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

For the reaction, A +2B → AB2, the order w.r.t. reactant A is 2 and w.r.t. reactant B. What will be change in rate of reaction if the concentration of A is doubled and B is halved?

  1. increases four times
  2. decreases four times
  3. increases two times
  4. no change



a. increases 4 times

Rate = [A] 2

If [A] is doubled then Rate’ = [2A] 2 = 4 [A] 2 = 4 Rate


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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.