Which one of the following statement is wrong for gases ?

Options

A. Gases do not have a definite shape and volume
B. Volume of the gas is equal to volume of container confining the gas
C. Confined gas exerts uniform pressure on the walls of its container in all directions
D. Mass of gas cannot be determined by weighing a container in which it is enclosed

Explanation

To determine which statement about gases is incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: Gases do not have a definite shape and volume.**
- Gases are characterized by having particles that are far apart and move freely. This means they take the shape and volume of their container. Therefore, this statement is **true**.

2. **Statement 2: The volume of the gas is equal to the volume of the container containing the gas.**
- When gas is placed in a container, it expands to fill the entire volume of that container. Thus, the volume of the gas is indeed equal to the volume of the container. Hence, this statement is **true**.

3. **Statement 3: Confined gas exerts uniform pressure on the walls of its container in all directions.**
- Gases exert pressure uniformly in all directions due to the random motion of gas particles colliding with the walls of the container. Therefore, this statement is also **true**.

4. **Statement 4: The mass of gas cannot be determined by weighing the container in which it is enclosed.**
- This statement is misleading. The mass of the gas can be determined by weighing the container with the gas and subtracting the mass of the empty container. Thus, this statement is **false** and is the incorrect statement among the options provided.

### Conclusion:
The incorrect statement regarding gases is: **"The mass of gas cannot be determined by weighing the container in which it is enclosed."**

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