Which of the following factors will favour the reverse reaction in a chemical equilibrium?

Options

A. increase in concentration of one of the reactants
B. increase in concentration of one of the products
C. removal of one of the products regularly
D. None of these

Explanation

To determine which factors favor the reverse reaction in a chemical equilibrium, we need to analyze the effects of concentration changes on the equilibrium position according to Le Chatelier's principle. Let's break down the steps:

### Step-by-Step Solution:

1. **Understanding Chemical Equilibrium**:
- A chemical equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction, resulting in constant concentrations of reactants and products.

2. **Le Chatelier's Principle**:
- This principle states that if an external change is applied to a system at equilibrium, the system will adjust to counteract that change and restore a new equilibrium.

3. **Effect of Concentration Changes**:
- **Increasing Reactant Concentration**: If we increase the concentration of reactants (A or B), the system will shift to the right (forward reaction) to produce more products (C and D).
- **Increasing Product Concentration**: If we increase the concentration of products (C or D), the system will shift to the left (reverse reaction) to produce more reactants (A and B).

4. **Removal of Products**:
- If we remove one of the products (C or D), the equilibrium will shift to the right (forward reaction) to replace the removed product.

5. **Conclusion**:
- The factors that favor the reverse reaction include:
- Increasing the concentration of one of the products (C or D).
- Decreasing the concentration of reactants (A or B).
- Therefore, the correct answer is that increasing the concentration of one of the products will favor the reverse reaction.

### Final Answer:
Increasing the concentration of one of the products (C or D) will favor the reverse reaction.

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