A chemicla reaction is said to attain equilibrium when

Options

A. reactants get completely converted into products
B. equal amounts of reactants and prodects are formed
C. the rate of forward reaction becomes equal to the rate of reverse reaction
D. the concentration of reactants and products are same

Answer

To determine when a chemical reaction is said to attain equilibrium, we can analyze the conditions that define this state. Here’s a step-by-step solution:

### Step 1: Understanding Chemical Equilibrium
A chemical reaction is said to reach equilibrium when the rates of the forward and reverse reactions are equal. This means that the amount of reactants and products remains constant over time, even though both reactions continue to occur.

**Hint:** Focus on the relationship between the forward and reverse reactions.

### Step 2: Evaluating the Options
1. **Option A:** Reactant gets completely converted into product.
- This is incorrect because, at equilibrium, it is not necessary for all reactants to be converted into products. Some reactants may remain.

**Hint:** Consider whether complete conversion is a requirement for equilibrium.

2. **Option B:** Equal amounts of reactant and product are formed.
- This is also incorrect. The amounts of reactants and products at equilibrium do not have to be equal.

**Hint:** Think about the concentrations of reactants and products at equilibrium.

3. **Option C:** The rate of forward reaction becomes equal to the rate of reverse reaction.
- This is correct. At equilibrium, the rate at which reactants are converted to products is equal to the rate at which products are converted back to reactants.

**Hint:** Recall the definition of equilibrium in terms of reaction rates.

4. **Option D:** The concentration of reactant and products are the same.
- This is incorrect. The concentrations of reactants and products can vary and do not need to be equal at equilibrium.

**Hint:** Concentration equality is not a requirement for equilibrium.

### Step 3: Conclusion
Based on the analysis, the correct answer is **Option C**: The rate of forward reaction becomes equal to the rate of reverse reaction.

**Final Answer:** Option C is the correct answer.