Assertion: The conductivity of an intrinsic semiconductor depends on its temperature
Reason: No important electronic devices can be developed using intrinsic semiconductors.

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 not 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 analyze the given statements, we need to evaluate both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "The conductivity of an intrinsic semiconductor depends on its temperature."

- **Explanation**: This is indeed true. The conductivity of intrinsic semiconductors is influenced by temperature because as the temperature increases, more electrons gain enough energy to jump from the valence band to the conduction band, thereby increasing the number of charge carriers and thus increasing conductivity.

### Step 2: Understand the Reason
The reason states that "No important electronic devices can be developed using intrinsic semiconductors."

- **Explanation**: This statement is also true. While intrinsic semiconductors have very low conductivity at room temperature, they are not typically used in practical electronic devices without doping. Doping with impurities (n-type or p-type) is necessary to enhance their conductivity and make them suitable for electronic applications.

### Step 3: Evaluate the Relationship Between Assertion and Reason
Now we need to determine if the reason provided is a correct explanation for the assertion.

- **Analysis**: Although both statements are true, the reason does not directly explain why the conductivity of intrinsic semiconductors depends on temperature. The assertion is about the relationship between temperature and conductivity, while the reason discusses the limitations of intrinsic semiconductors in practical applications. Therefore, the reason does not serve as a correct explanation for the assertion.

### Conclusion
- **Final Evaluation**: Both the assertion and reason are true, but the reason is not a correct explanation for the assertion.

### Answer
The correct option is that both statements are true, but the reason is not a correct explanation for the assertion.

---