Which graph is/are incorrect for a pure liquid evaporating in a
closed container?

Options

A.
B.
C.
D.

Explanation

To determine which graphs are incorrect for a pure liquid evaporating in a closed container, we need to understand the behavior of evaporation and the concept of equilibrium in a closed system.

### Step-by-Step Solution:

1. **Understanding Evaporation in a Closed Container**:
- When a pure liquid is placed in a closed container, it will start to evaporate. The molecules at the surface of the liquid gain enough energy to escape into the gas phase.

2. **Establishing Equilibrium**:
- As evaporation occurs, the vapor pressure of the gas above the liquid increases. Eventually, a point is reached where the rate of evaporation equals the rate of condensation (gas molecules returning to the liquid phase). This is known as dynamic equilibrium.

3. **Behavior of Evaporation Rate**:
- At the start, the evaporation rate increases as more molecules escape into the gas phase. However, once equilibrium is established, the rate of evaporation becomes constant over time.

4. **Analyzing the Graphs**:
- **Graph 1**: If the graph shows a continuous increase in evaporation rate without leveling off, it is incorrect because the rate should stabilize at equilibrium.
- **Graph 2**: If the graph shows a decrease in evaporation rate after some time, it is also incorrect because the rate should remain constant after equilibrium is reached.
- **Graph 3**: If the graph shows a fluctuating evaporation rate without stabilizing, it is incorrect for the same reason.
- **Graph 4**: If the graph shows a constant decrease in evaporation rate, it is incorrect because, again, the rate should stabilize.

5. **Conclusion**:
- The incorrect graphs for a pure liquid evaporating in a closed container are those that do not show a constant rate after equilibrium is reached. Therefore, the answer includes graphs that depict continuous increase, decrease, or fluctuation in the evaporation rate.

### Final Answer:
The incorrect graphs are options 2, 3, and 4.