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 selecting the incorrect statement regarding chemical kinetics, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding Threshold Energy**:
- The first statement claims that the minimum amount of energy required by the reactant molecules to form products is called threshold energy.
- **Analysis**: This statement is correct. Threshold energy is indeed the minimum energy required for a reaction to occur.

2. **Understanding Activation Energy**:
- The second statement asserts that activation energy is the sum of threshold energy and average kinetic energy.
- **Analysis**: This statement is incorrect. Activation energy is the energy required to reach the transition state from the reactants. It is not defined as the sum of threshold energy and average kinetic energy. Instead, threshold energy is the sum of the internal energy of the reactants and the activation energy.

3. **Threshold Energy Definition**:
- The third statement states that threshold energy is the sum of the initial potential energy of the reactants and the activation energy.
- **Analysis**: This statement is correct. Threshold energy does indeed consist of the internal energy of the reactants plus the activation energy.

4. **Effect of Activation Energy on Reaction Rate**:
- The fourth statement claims that a lower activation energy results in a faster reaction.
- **Analysis**: This statement is also correct. A lower activation energy means that more reactant molecules can overcome the energy barrier, leading to an increased rate of reaction.

### Conclusion:
- After analyzing all the statements, the incorrect statement is the second one: "Activation energy is the sum of threshold energy and average kinetic energy."

### Final Answer:
The incorrect statement is the second statement.

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