Which of the following graph is correct for zero order reaction?

Options

A.
B.
C.
D.

Answer

To determine the correct graph for a zero-order reaction, we need to understand the characteristics of zero-order kinetics.

### Step-by-Step Solution:

1. **Understanding Zero-Order Reactions**:
- In a zero-order reaction, the rate of the reaction is constant and does not depend on the concentration of the reactants. This means that the rate (R) is equal to a constant (K).
- Mathematically, this can be expressed as:
\[ R = K \]
- Since the rate is constant, changes in the concentration of the reactant do not affect the rate of the reaction.

2. **Graphical Representation**:
- For a zero-order reaction, if we plot the rate of the reaction (R) against the concentration of the reactant ([A]), we will get a horizontal line (a straight line parallel to the x-axis) because the rate remains constant regardless of the concentration.
- This means that the graph will not show any slope; it will simply be a straight line.

3. **Analyzing the Options**:
- We are given four options (graphs) to choose from.
- We need to identify which graph represents a horizontal line, indicating that the rate does not change with concentration.

4. **Conclusion**:
- Upon analyzing the options, the correct graph for a zero-order reaction is the one that shows a straight line parallel to the x-axis, which corresponds to option number 4.

### Final Answer:
The correct graph for a zero-order reaction is **Option 4**.