When the system A + B = C + D is at equilibrium? (a) the forward reaction has stopped. (b) both the forward and the reverse reactions have stopped. (c) the reverse reaction has stopped. (d) neither the forward nor the reverse reaction has stopped.

Answer: (d) neither the forward nor the reverse reaction has stopped.

Chemical equilibrium is dynamic in nature wherein concentrations of both reactant and product change constantly with equal speed.

Chemical equilibrium

Chemical equilibrium is the state of a system in which the concentration of the reactant and the concentration of the products do not change over time and the system does not display any further change in properties.

Examples

  • N2 (g) + O2 (g) ⇌ 2NO (g)

The above equation is an example of homogeneous chemical equilibrium wherein reactant and products present in the same phases.

  • CO2 (g) + C (s) ⇌ 2CO (g)

The above reaction is an example of heterogeneous chemical equilibrium wherein reactant and products present in different phases.

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