Question

For a gas phase reaction, A + 3B = 2C, if some inerts are added into the system under otherwise uniform conditions, conversion of A will

• A. Decrease
• B. Increase
• C. Remain unaffected
• D. May decrease or may increase, unpredictable

Hint:

When inert gases are added to a gas-phase reaction, they reduce the partial pressure of the reactants, which in turn decreases the reaction rate and the conversion.

Answer 1

The Correct Option is A

Step 1: Understanding the effect of inert gases.
Inert gases do not participate in the reaction but affect the partial pressures of the reactants and products. For a gas-phase reaction, adding inert gases reduces the partial pressure of the reactants, which in turn decreases the reaction rate. The conversion of A is directly related to the partial pressure of A.
Step 2: Analyzing the impact.
By introducing inert gases, the partial pressure of A decreases, leading to a decrease in the rate of reaction. As a result, the conversion of A will decrease.
Step 3: Conclusion.
The correct answer is (1) Decrease, as the addition of inert gases reduces the partial pressure of the reactants, lowering the conversion of A.