Which of the following features is NOT a characteristic of a state of equilibrium? A - HSC - SSCE Chemistry - Question 3 - 2022 - Paper 1

To determine the feature that is NOT characteristic of a state of equilibrium, we need to analyze each option:

1. Equilibrium is achieved in a closed system.

   • This is a true statement; equilibrium can only be established in a closed environment where no matter enters or exits.

2. Equilibrium position depends on temperature.

   • This statement is true; the position of equilibrium shifts with changes in temperature, particularly in exothermic or endothermic reactions.

3. Equilibrium can be reached from either direction.

   • This is also true; whether reactants convert to products or products convert back to reactants, equilibrium can be established from either side.

4. Equilibrium concentrations of reactants and products are equal.

   • This statement is false in general; at equilibrium, the concentrations of reactants and products do not have to be equal, only the rates of their formation and decay.

Based on the analysis, the correct answer is D.