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Assertion (A) : Adding inert gas to diss...

Assertion (A) : Adding inert gas to dissociation equilibrium of `N_(2)O_(4)` at constant pressure and temperature increases the dissociation.
Reason (R) : molar concentration of the reactants and products decreases.

A

If both (A) and (R) are correct, and (R) is the correct explanation for (A)

B

If both (A) and (R) are correct, but (R) is not the correct explanation of (A)

C

If (A) is correct, but (R) is incorrect

D

If (A) is incorrect, but (R) is correct.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. **Step 1: Understand the Assertion (A)** The assertion states that adding an inert gas to the dissociation equilibrium of \( N_2O_4 \) at constant pressure and temperature increases the dissociation. - **Explanation**: When an inert gas is added to a system at constant pressure, it does not participate in the reaction but increases the total pressure of the system. According to Le Chatelier's principle, if the pressure of a gaseous system is increased, the equilibrium will shift in the direction that reduces the pressure. In the case of \( N_2O_4 \) dissociating into \( 2NO_2 \), the forward reaction produces more moles of gas, which means that the equilibrium will shift to the right (towards the products) to counteract the increase in pressure. Therefore, the assertion is correct. **Step 2: Understand the Reason (R)** The reason states that the molar concentration of the reactants and products decreases. - **Explanation**: When an inert gas is added, the total pressure increases, but the partial pressures of the reactants and products decrease. However, this does not mean that the molar concentration of the products decreases. In fact, as the equilibrium shifts to the right, the concentration of \( NO_2 \) (the product) increases, while the concentration of \( N_2O_4 \) (the reactant) decreases. Thus, the reason provided is incorrect because it states that the molar concentration of reactants and products decreases, which is not true for the products. **Step 3: Conclusion** Based on the analysis: - The assertion (A) is correct. - The reason (R) is incorrect. Thus, the correct answer is that Assertion A is correct, and Reason R is incorrect.
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