Assertion :- A gas mixed with another gas forms a colloidal solution.
Reason :- Mixture of gases is homogenous system.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False.

Answer

To analyze the given assertion and reason, we will break down the statements step by step.

### Step 1: Understand the Assertion
The assertion states that "A gas mixed with another gas forms a colloidal solution."

**Evaluation**:
- A colloidal solution is a mixture where one substance is dispersed evenly throughout another. Colloids typically involve larger particles (like proteins or starch) suspended in a liquid or gas.
- When two gases mix, they do not form a colloidal solution; instead, they form a homogeneous solution.

**Conclusion**: The assertion is **false**.

### Step 2: Understand the Reason
The reason states that "A mixture of gases is a homogeneous system."

**Evaluation**:
- A homogeneous mixture is one in which the composition is uniform throughout.
- When gases mix, such as in the case of air (which is a mixture of nitrogen, oxygen, carbon dioxide, etc.), they do indeed form a homogeneous mixture.

**Conclusion**: The reason is **true**.

### Step 3: Combine the Evaluations
Now we combine our evaluations of the assertion and the reason:
- The assertion is false because a gas mixed with another gas does not form a colloidal solution; it forms a homogeneous solution.
- The reason is true because a mixture of gases is indeed a homogeneous system.

### Final Conclusion
The assertion is **false**, and the reason is **true**. Therefore, the correct answer is that the assertion is wrong, but the reason is correct.

---