Which one of the following statements is wrong for gases?

Options

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

Explanation

To determine which statement about gases is incorrect, let's analyze each statement one by one:

1. **Statement 1**: "Gases do not have a definite shape and volume."
- This statement is **correct**. Gases have neither a definite shape nor a definite volume. They take the shape and volume of their container due to the negligible intermolecular forces between gas particles.

2. **Statement 2**: "The volume of the gas is equal to the volume of the container confining the gas."
- This statement is also **correct**. Gases expand to fill the entire volume of their container, meaning the volume of the gas is equal to the volume of the container.

3. **Statement 3**: "Confined gas exerts uniform pressure on the walls of its container in all directions."
- This statement is **correct** as well. Due to the random motion of gas particles, they collide with the walls of the container, exerting pressure uniformly in all directions.

4. **Statement 4**: "The mass of the gas cannot be determined by weighing a container in which it is enclosed."
- This statement is **incorrect**. The mass of the gas can indeed be determined by weighing the container with the gas and then subtracting the weight of the empty container. This allows us to find the mass of the gas inside.

Based on the analysis above, the wrong statement about gases is **Statement 4**.

### Summary:
The wrong statement regarding gases is: "The mass of the gas cannot be determined by weighing a container in which it is enclosed."

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