JEE Chemistry 2023 Question with Solution

Given: Four statements about equilibrium in physical form are to be checked.

Find: The number of correct statements.

Evaluate each statement using the conditions of equilibrium.

1. Statement (1): Equilibrium is possible only in a closed system at a given temperature. This is correct because a closed system is needed to prevent loss of matter and maintain equilibrium.

2. Statement (2): Both the opposing processes occur at the same rate. This is correct because at equilibrium, the forward and reverse processes occur at equal rates.

3. Statement (3): When equilibrium is attained at a given temperature, the value of all its parameters becomes constant. This is incorrect as stated in the solution, so it is not counted as correct.

4. Statement (4): For dissolution of solids in liquids, the solubility is constant at a given temperature. This is correct because solubility has a fixed value at a specified temperature.

Therefore, the correct statements are (1), (2), and (4).

So, the number of correct statements is $3$.

Given: Statements related to physical equilibrium.

Find: How many of them are correct.

From the extracted solution:

• (1) Closed system at a given temperature is required for equilibrium. Hence, correct.
• (2) Opposing processes occur at the same rate at equilibrium. Hence, correct.
• (3) The solution marks this statement as incorrect and does not include it in the final count.
• (4) Solubility of a solid in a liquid is constant at a fixed temperature. Hence, correct.

Thus, total correct statements:

Hence, the final answer is $3$.