Assertion:`Na_(2)O` is basic whereas `Cl_(2)O_(7) ` is acidic oxide.
Reason:Elements on extreme left form basic oxide whereas elements on extreme right form acidic oxides.

Options

A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion
C. Assertion is correct but Reason is incorrect.
D. Both Assertion and Reason are incorrect

Explanation

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

### Step 1: Analyze the Assertion
**Assertion:** `Na2O` is basic whereas `Cl2O7` is acidic oxide.

- **Explanation:** Sodium oxide (`Na2O`) is formed from sodium, which is an alkali metal (Group 1 element). When sodium oxide is dissolved in water, it forms sodium hydroxide (`NaOH`), which is a strong base. This means that `Na2O` is indeed a basic oxide.

- On the other hand, `Cl2O7` (dichlorine heptoxide) is a compound formed from chlorine, which is a non-metal (Group 17 element). When `Cl2O7` is dissolved in water, it forms perchloric acid (`HClO4`), which is a strong acid. Therefore, `Cl2O7` is an acidic oxide.

**Conclusion for Step 1:** The assertion is correct.

### Step 2: Analyze the Reason
**Reason:** Elements on extreme left form basic oxides whereas elements on extreme right form acidic oxides.

- **Explanation:** The reason states that elements on the extreme left of the periodic table (like alkali metals) tend to form basic oxides, which is true. For example, sodium (Na) forms `Na2O`, which is basic.

- The reason also states that elements on the extreme right of the periodic table (like halogens) form acidic oxides, which is also true. For example, chlorine (Cl) forms `Cl2O7`, which is acidic.

**Conclusion for Step 2:** The reason is correct, but it does not specifically explain why `Na2O` is basic and `Cl2O7` is acidic in the context of the assertion.

### Final Conclusion
- Both the assertion and the reason are correct.
- However, the reason provided does not serve as the correct explanation for the assertion.

### Answer
The correct option is: **Both assertion and reason are correct, but the reason is not the correct explanation for the assertion.**

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