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Which one of the following statements regarding a dynamic equilibrium is false?

Option: 1

At equilibrium, there is no net change in the system

Option: 2

At equilibrium, the concentration of reactants and products stays the same.

Option: 3

 At equilibrium, the forward and back reactions cease to occur

Option: 4

At equilibrium, the rates of the forward and back reactions are identical

Answers (1)


As we have learnt,

Characteristics of Chemical Equilibrium -

The following are the important characteristics of equilibrium:

  • It is obtained only when the reversible reaction is carried out in a closed space.
  • Here the rate of forward reaction is equal to rate of backward reaction.
  • Here both forward and backward reactions are taking place with same rate hence the relative amounts of the reactants and products present at equilibrium does not change with time.
  • At constant temperature, it is characterized by properties like colour, density, pressure etc.
  • It is possible from both sides.
  • It is dynamic in nature. It means the reaction or process is not going to be ceased as reaction occurs in both directions with equal rates. 
  • A catalyst cannot alter the positive of equilibrium as it accelerates both the forward and backward reactions to the same extent this means the same state of equilibrium is reaction i.e., a positive catalyst can set up equilibrium in less time but can not change it.
  • At equilibrium ?G is equal to zero i.e.,
    ?G = ?H - T?S
    ?H = T?S
  • Under the similar conditions of temperature, concentration and pressure, the same state of equilibrium is reached.


At equilibrium, there is no net change in the system. It is tempting to think that this means nothing is happening at the level of the forward and back reactions - that is, that the forward and back reactions cease to occur. However, this is not true. Instead, the forward and back reactions happen at the same rates, so that they effectively cancel each other out - hence the reason that, to the observer, there is no observable change in the system.

Therefore, the option number(3) is correct.

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