Select the incorrect statement

Options

A. The minimum amount of energy required by reactant molecules to give product is threshold energy
B. Activation energy is the sum of threshold energy and average kinetic energy
C. Threshold energy is the sum of initial potential energy of reactants and activation energy
D. Lower is the activation energy faster is the reaction

Answer

To solve the question of identifying the incorrect statement regarding chemical kinetics, let's analyze each statement step by step.

### Step 1: Analyze the Statements

1. **Statement 1**: "Minimum amount of energy required by reactant molecule to give product is threshold energy."
- This statement is correct. The threshold energy is indeed the minimum energy required for reactants to transform into products.

2. **Statement 2**: "Activation energy is the sum of threshold energy and average kinetic energy."
- This statement is incorrect. Activation energy (Ea) is not the sum of threshold energy and average kinetic energy. Instead, activation energy is the energy barrier that must be overcome for a reaction to occur, and it is related to the threshold energy minus the average kinetic energy of the reactants.

3. **Statement 3**: "Threshold energy is the sum of initial potential energy of the reactant and activation energy."
- This statement is also correct. Threshold energy can be understood as the total energy required to reach the transition state, which includes the initial potential energy of the reactants plus the activation energy.

4. **Statement 4**: "Lower is the activation energy, faster is the reaction."
- This statement is correct. A lower activation energy means that more reactant molecules have sufficient energy to overcome the energy barrier, leading to a faster reaction rate.

### Conclusion

After analyzing all the statements, we find that:

- Statement 1 is correct.
- Statement 2 is incorrect.
- Statement 3 is correct.
- Statement 4 is correct.

Thus, the incorrect statement is **Statement 2**.

### Final Answer

The incorrect statement is: **"Activation energy is the sum of threshold energy and average kinetic energy."**

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