The wrong statement is

Options

A. All the colliisons between reactant molecules do not lead to a chemical change.
B. A zero order reaction proceeds at a constant rate independent of concentration or time.
C. Fast reactions have low activation energies.
D. In a first order reaction, the reaction ideally takes finite time to be complete.

Answer

To determine the wrong statement from the given options regarding chemical kinetics, we will analyze each statement one by one.

### Step 1: Analyze Option A
**Statement:** All the collisions between reactant molecules do not lead to a chemical change.

**Explanation:** This statement is true. Not all collisions between reactant molecules result in a reaction. For a reaction to occur, the colliding molecules must have sufficient energy (known as threshold energy) and proper orientation. Therefore, this option is correct.

### Step 2: Analyze Option B
**Statement:** A zero-order reaction proceeds at a constant rate independent of concentration or time.

**Explanation:** This statement is also true. In a zero-order reaction, the rate of reaction is constant and does not depend on the concentration of the reactants. The rate law for a zero-order reaction can be expressed as Rate = k, where k is the rate constant. Therefore, this option is correct.

### Step 3: Analyze Option C
**Statement:** Fast reactions have low activation energies.

**Explanation:** This statement is true. Fast reactions typically have low activation energies, meaning that a greater number of molecules have sufficient energy to overcome the energy barrier for the reaction to occur. Therefore, this option is correct.

### Step 4: Analyze Option D
**Statement:** In a first-order reaction, the reaction ideally takes finite time to complete.

**Explanation:** This statement is false. First-order reactions do not complete in a finite amount of time; they asymptotically approach completion. This means that theoretically, they take an infinite amount of time to reach completion. Therefore, this option is incorrect.

### Conclusion
The wrong statement among the options provided is **Option D**.

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