Assertion: The conductivity of electrolytic soutions increase with increase of temperture.
Reason: Electronic conductance decrease with increase of temperture.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion .
B. If both assertion and reason are true but reason is not the correct explanation of assertion .
C. If assertion is true but reason is false .
D. If both assertion and reason are false .

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states: "The conductivity of electrolytic solutions increases with an increase in temperature."

- **Explanation**: Conductivity in electrolytic solutions is primarily due to the movement of ions. As temperature increases, the kinetic energy of the ions also increases, leading to a higher number of ions being able to move freely. This results in an increase in ionic conductivity, which is a key component of the overall conductivity of the solution.

### Step 2: Analyze the Reason
The reason states: "Electronic conductance decreases with an increase in temperature."

- **Explanation**: Electronic conductance is related to the flow of free electrons in a material. As temperature increases, the resistance to the flow of electrons can also increase due to increased collisions among the electrons and the lattice structure of the material. This can lead to a decrease in electronic conductance.

### Step 3: Compare Assertion and Reason
- Both the assertion and the reason are correct statements in their own right.
- However, the assertion is specifically about ionic conductivity in electrolytic solutions, while the reason pertains to electronic conductance, which is a different concept.

### Step 4: Conclusion
Since both the assertion and reason are correct, but the reason does not explain the assertion, we conclude that:

- **Final Answer**: The assertion is correct, the reason is correct, but the reason does not explain the assertion.