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K(c)Value of a gaseous reaction is Smole...

`K_(c)`Value of a gaseous reaction is Smole/lit. If pressure is increased.

A

Forward reaction is favoured

B

Backward reaction is favoured

C

Reaction is uneffected

D

`K_(c)` value increases

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the effect of increased pressure on the equilibrium of a gaseous reaction with a given \( K_c \) value, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Reaction**: We are given a gaseous reaction where the equilibrium constant \( K_c \) is 5 mol/L. This indicates that the reaction involves gaseous reactants and products. 2. **Identify the Moles of Gases**: The unit of \( K_c \) (mol/L) suggests that there are more moles of gas on the product side than on the reactant side. For example, if we consider a reaction of the form: \[ aA(g) \rightleftharpoons bB(g) \] where \( b > a \), it indicates that there are more moles of products than reactants. 3. **Le Chatelier's Principle**: According to Le Chatelier's principle, if a system at equilibrium is subjected to a change in pressure, the equilibrium will shift in the direction that opposes the change. Specifically, if pressure is increased, the equilibrium will shift towards the side with fewer moles of gas. 4. **Determine the Direction of Shift**: Since we have established that there are more moles of products than reactants (i.e., \( b > a \)), increasing the pressure will favor the side with fewer moles, which is the reactant side. 5. **Conclusion**: Therefore, when the pressure is increased, the equilibrium will shift towards the reactants, favoring the backward reaction. 6. **Effect on \( K_c \)**: It is important to note that the value of \( K_c \) remains unchanged by changes in pressure or concentration. Thus, the \( K_c \) value does not increase or decrease; it stays constant. ### Final Answer: When pressure is increased, the backward reaction is favored (the reaction shifts to the left), and the \( K_c \) value remains unchanged. ---
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