The number of correct statement/s involving equilibria in physical process from the following is
(A) Equilibrium is possible only in a closed system at a given temperature
(B) Both the opposing processes occur at the same rate.
(C) When equilibrium is attained at a given temperature, the value of all its parameters became equal
(D) For dissolution of solids in liquids, the solubility is constant at a given temperature
(A) Equilibrium is possible only in a closed system at a given temperature
(B) Both the opposing processes occur at the same rate.
(C) When equilibrium is attained at a given temperature, the value of all its parameters became equal
(D) For dissolution of solids in liquids, the solubility is constant at a given temperature
Answer: 3
Solution
A physical equilibrium can be maintained only in a closed vessel at a fixed temperature, otherwise matter escapes and the two opposing changes cannot balance, so the first statement is correct. At equilibrium the forward and backward processes keep going but at equal rates, giving a dynamic steady state, so the second statement is correct. What happens to the measurable properties at equilibrium is that they become constant with time; they do not become equal to one another, so the statement that all the parameters become equal is wrong. For a solid dissolving in a liquid the saturated solution is the equilibrium state, and its solubility has a definite value fixed by the temperature, so the last statement is correct. The number of correct statements is three.
JEE Main · 2023 · 10 Apr 2023 · Shift 1 · Integer answer