For the chemical reaction N 2 g + 3 H 2 g ⇋ 2 N H 3 g , the correct option is:

For the chemical reaction N2g+3H2g⇋2NH3g, the correct option is:
  1. -13d[H2]dt=-12d[NH3]dt
  2. -d[N2]dt=2d[NH3]dt
  3. -d[N2]dt=12d[NH3]dt
  4.  3d[H2]dt=2d[NH3]dt

Solution

For the reaction $N_{2}(g) + 3H_{2}(g) \Leftrightarrow 2NH_{3}(g)$, Rate = $\frac{\text{Change in concentration of reactants or products}}{\text{time taken for change}}$ Rate = $-\frac{d[N_{2}]}{dt} = -\frac{1}{3}\frac{d[H_{2}]}{dt} = \frac{1}{2}\frac{d[NH_{3}]}{dt}$ $\therefore -\frac{d[N_{2}]}{dt} = \frac{1}{2}\frac{d[NH_{3}]}{dt}$ A negative sign before a reaction rate symbol signifies a decrease in concentration of reactant with increase of time.

Asked in: NEET 2019 (All India)

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