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ChemistryNEET 2019Rate law, order and molecularity

Chemical Kinetics

For the chemical reaction N2(g)+3H2(g)⇌2NH3(g)\mathrm{N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)}, the correct expression relating the rates of disappearance/appearance of each species is:

  1. A.13d[H2]dt=12d[NH3]dt\dfrac{1}{3}\dfrac{d[H_2]}{dt} = \dfrac{1}{2}\dfrac{d[NH_3]}{dt}
  2. B.d[N2]dt=2d[NH3]dt\dfrac{d[N_2]}{dt} = 2\dfrac{d[NH_3]}{dt}
  3. C.−d[N2]dt=12d[NH3]dt-\dfrac{d[N_2]}{dt} = \dfrac12\dfrac{d[NH_3]}{dt}✓
  4. D.3d[H2]dt=2d[NH3]dt3\dfrac{d[H_2]}{dt} = 2\dfrac{d[NH_3]}{dt}

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