Verified Solution • 2025–26 Session moderate

QJEEM19Ch5fbc: JEE Main 2019 Chemistry - Class 12 JEEM19Ch5fbc Solution: For the reaction, 2A + B  products, when the…

For the reaction, 2A + B →\to  products, when the concentrations of A and B both were doubled, the rate of the reaction increased from 0.3 mol L −- 1s −- 1 to 2.4 mol L −- 1s −- 1. When the concentration of A alone is doubled, the rate increased from 0.3 mol L −- 1s −- 1 to 0.6 mol L −- 1s −- 1.

Multiple Choice Options

  • A Total order of the reaction is 4
  • B Order of the reaction with respect to B is 2
  • C Order of the reaction with respect to B is 1
  • D Order of the reaction with respect to A is 2

Step-by-Step Verified Solution

r=K[A]x[B]yr = K{\left[ A \right]^x}{\left[ B \right]^y}

⇒8=23=2x+y\Rightarrow 8 = {2^3} = {2^{x + y}}

⇒x+y=3 ...(1)\Rightarrow x + y = 3\,...(1)

⇒2=2x\Rightarrow 2 = {2^x}

⇒x=1,y=2\Rightarrow x = 1,y = 2

Order w.r.t. A = 1

Order w.r.t. B = 2

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