Which of the following is incorrect statement?

Options

A. Stoichiometery of a reaction tells about the order of the elementary reactions.
B. For a zero order reaction, rate and the rate constant are identical.
C. A zero oder is controlled by factors other than concentration of reactions.
D. A zero order reaction is an elementary reaction.

Explanation

To determine which of the following statements is incorrect, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Option A**: "Stoichiometry of reaction tells about the order of elementary reaction."
- **Analysis**: This statement is true. The stoichiometric coefficients of reactants in an elementary reaction correspond to the order of that reaction. For elementary reactions, the order can be directly determined from the balanced equation.

2. **Option B**: "For a zero-order reaction, the rate and the rate constants are identical."
- **Analysis**: This statement is also true. In a zero-order reaction, the rate of reaction is constant and does not depend on the concentration of reactants. The rate is equal to the rate constant (k) since the concentration term raised to the power of zero equals one.

3. **Option C**: "A zero-order reaction is controlled by factors other than the concentration of reactants."
- **Analysis**: This statement is true as well. In zero-order reactions, the rate is independent of the concentration of reactants, meaning that other factors (like temperature, pressure, or catalysts) control the rate of the reaction.

4. **Option D**: "A zero-order reaction is an elementary reaction."
- **Analysis**: This statement is incorrect. While some zero-order reactions can be elementary, not all zero-order reactions are elementary. Zero-order kinetics can also arise from complex reactions where the rate-determining step is zero-order. Therefore, this statement is misleading.

### Conclusion:
The incorrect statement is **Option D**: "A zero-order reaction is an elementary reaction."