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NEET 2019
Exam
NEET
Year
2019
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2019 · Chemistry · Chemical Kinetics

For the chemical reaction N _ 2 (g) + 3 H _ 2 (g) ⇋ 2N H _ 3 (g) ,...

For the chemical reaction N2(g)+3H2(g)⇋2NH3(g){N}_{2}\left(g\right) + 3{H}_{2}\left(g\right) ⇋ 2N{H}_{3}\left(g\right), the correct option is:

Options

  1. A−13d[H2]dt=−12d[NH3]dt- \dfrac{1}{3}\dfrac{d [ {H}_{2} ]}{dt} = - \dfrac{1}{2}\dfrac{d [ N{H}_{3} ]}{dt}
  2. B−d[N2]dt=2d[NH3]dt- \dfrac{d [ {N}_{2} ]}{dt} = 2\dfrac{d [ N{H}_{3} ]}{dt}
  3. C−d[N2]dt=12d[NH3]dt- \dfrac{d [ {N}_{2} ]}{dt} = \dfrac{1}{2}\dfrac{d [ N{H}_{3} ]}{dt}
  4. D3d[H2]dt=2d[NH3]dt3\dfrac{d [ {H}_{2} ]}{dt} = 2\dfrac{d [ N{H}_{3} ]}{dt}

Correct answer

C. −d[N2]dt=12d[NH3]dt- \dfrac{d [ {N}_{2} ]}{dt} = \dfrac{1}{2}\dfrac{d [ N{H}_{3} ]}{dt}

Step-by-step solution

For the reaction N2(g)+3H2(g)⇌2NH3(g){N}_{2}\left(g\right) + 3{H}_{2}\left(g\right) ⇌ 2N{H}_{3}\left(g\right),

Rate=Changeinconcentrationofreactantsorproductstimetakenforchange\dfrac{Changeinconcentrationofreactantsorproducts}{timetakenforchange}

Rate =−d[N2]dt=−13d[H2]dt=12d[NH3]dt= \dfrac{- d\left[{N}_{2}\right]}{dt} = \dfrac{- 1}{3}\dfrac{d\left[{H}_{2}\right]}{dt} = \dfrac{1}{2}\dfrac{d\left[N{H}_{3}\right]}{dt}

∴−d[N2]dt=12d[NH3]dt∴ \dfrac{- d\left[{N}_{2}\right]}{dt} = \dfrac{1}{2}\dfrac{d\left[N{H}_{3}\right]}{dt}

A negative sign before a reaction rate symbol signifies a decrease in concentration of reactant with increase of time.

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