(A) : Gases between themselves cannot form a colloidal solution.
(R): Gases give homogenous mixture 

Options

A. Both A & R are true, R is the correct explanation of A
B. Both A & R are true, R is not correct explanation of A
C. A is true, R is false
D. A is false, R is true

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step 1: Analyze the Assertion (A)
The assertion states: "Gases between themselves cannot form a colloidal solution."

- **Explanation**: A colloidal solution is a type of mixture where one substance (the dispersed phase) is evenly distributed within another (the continuous phase). Colloids are characterized by their heterogeneous nature, meaning that the components can be distinguished from one another at a microscopic level. Gases, when mixed together, do not form a distinct dispersed phase and continuous phase; rather, they form a homogeneous mixture where the gas molecules are uniformly distributed.

### Step 2: Analyze the Reason (R)
The reason states: "Gases give a homogeneous mixture."

- **Explanation**: When gases are mixed, they do not separate into distinct layers or phases. Instead, they combine to form a uniform mixture where the composition is consistent throughout. This is a characteristic of homogeneous mixtures, where the individual components are not distinguishable from one another.

### Step 3: Determine the Truth of Each Statement
- **Assertion (A)**: True. Gases cannot form a colloidal solution because they do not create a heterogeneous mixture.
- **Reason (R)**: True. Gases do form a homogeneous mixture when mixed together.

### Step 4: Evaluate the Relationship Between A and R
Since both the assertion and the reason are true, we need to determine if the reason provides a correct explanation for the assertion. The reason explains that gases form a homogeneous mixture, which supports the assertion that they cannot form a colloidal solution (which is heterogeneous).

### Conclusion
Both the assertion and the reason are true, and the reason is the correct explanation of the assertion. Thus, the correct answer is that both statements are true, and R is the correct explanation of A.

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