Question

Which of the following is not a characteristic of equilibrium?

• A. Rate is equal in both directions
• B. Equilibrium occurs only in open vessels at constant temperature.
• C. Measurable quantities are constant at equilibrium
• D. Equilibrium occurs in reversible conditions

Answer 1

The correct option is B Equilibrium occurs only in open vessels at constant temperature.

The state of chemical equilibrium is achieved by the system when the rate of forward reaction is equal to the rate of the reverse reaction.
The system is said to be in dynamic equilibrium when there is no further change in the concentrations of the reactants and the products due to the equal rates of the forward and backward reactions.
Characteristics of equilibrium:
At equilibrium, the rate of forward reaction is equal to rate of backward reaction.
There are some equilibrium concentrations in which the concentrations of the reactants and products reach constant values.
A catalyst does not alter the position of equilibrium, but it affects the rate at which the equilibrium attained.
Equilibrium state can only be achieved if a reversible reaction is carried out in a closed space.

Hence, option (b) is the correct answer.