Assertion : `CaO +SO_3 to CaSO_3` in an acid base reaction
Reason: It is in accordance with Bronsted concept.

Options

A. Assertion and reason both are correct statements and Reason is correct explanation for assertion.
B. Assertion and reason both are correct statement but reason is not correct explanation for assertion
C. Assertion is correct statement but reason is wrong statement.
D. Assertion is wrong statement but reason is correct statement

Answer

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

### Step 1: Analyze the Assertion
The assertion states that the reaction \( \text{CaO} + \text{SO}_3 \rightarrow \text{CaSO}_3 \) is an acid-base reaction.

- **Explanation**: Calcium oxide (CaO) is a basic oxide, and sulfur trioxide (SO3) can be considered an acidic oxide. When they react, they form calcium sulfite (CaSO3), which is a salt. This reaction can indeed be classified as an acid-base reaction because it involves the combination of a base (CaO) and an acid (SO3).

### Step 2: Analyze the Reason
The reason states that this reaction is in accordance with the Brønsted concept of acids and bases.

- **Explanation**: According to the Brønsted-Lowry theory, an acid is a substance that donates protons (H+ ions), and a base is a substance that accepts protons. In the reaction \( \text{CaO} + \text{SO}_3 \), there is no direct transfer of protons. Instead, the reaction involves the formation of a salt without the release or acceptance of H+ ions. Therefore, while the assertion is correct, the reason provided does not accurately describe the nature of the reaction according to the Brønsted concept.

### Step 3: Conclusion
Based on the analysis:
- The assertion is true: \( \text{CaO} + \text{SO}_3 \rightarrow \text{CaSO}_3 \) is an acid-base reaction.
- The reason is false: The reaction does not involve proton transfer as per the Brønsted concept.

Thus, the answer to the question is that the assertion is correct but the reason is incorrect.

### Final Answer
- Assertion: True
- Reason: False
- Therefore, the answer is C (Assertion is true, Reason is false).

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