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Equilibrium — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEquilibrium3 Marks
Question
$2\text{NO}(\text{g})+\text{O}_2(\text{g})\rightleftharpoons2\text{NO}_2(\text{g}),\Delta\text{H}=-117\text{J}$
Predict the effect of an increase in concentration of NO on the equilibrium concentration of $\text{NO}_2$.
Predict the effect of pressure decrease as a result of increased volume on the equilibrium concentration of $\text{NO}_2$.
✓

Answer

$2\text{NO}(\text{g})+\text{O}_2(\text{g})\rightleftharpoons2\text{NO}_2(\text{g});\Delta\text{H}=-117\text{J}$
  1. If we increase the concentration of $\text{NO}_2$ the rate of forward reaction will increase, i.e. more $\text{NO}_2$ will be formed.
  2. Decrease in pressure will favour backward reaction, i.e. less $\text{NO}_2$ will be formed because number of moles of reactants are more than products.

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