Assertion : When `CO_2` is continuously bubbled through lime water, a precipitation is formed which later dissolves
Reason : Calcium carbonate is initially formed which reacts further with `CO_2` to form calcium bicarbonate.

Options

A. If both Assertion and Reason are correct and Reason is the Correct explanation of the Assertion.
B. If both Assertion and Reason are Correct but Reason is not the Correct explanation of the Assertion.
C. If Assertion is Correct but Reason is Incorrect
D. If Assertion is incorrect but Reason is Correct

Answer

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

### Step 1: Understand the Assertion
The assertion states that when CO2 is continuously bubbled through lime water, a precipitate is formed which later dissolves.

- **Explanation**: Lime water is a dilute solution of calcium hydroxide (Ca(OH)2). When CO2 is bubbled through lime water, it reacts with calcium hydroxide to form calcium carbonate (CaCO3), which is insoluble in water and appears as a white precipitate.

### Step 2: Understand the Reason
The reason states that calcium carbonate is initially formed, which reacts further with CO2 to form calcium bicarbonate.

- **Explanation**: The reaction can be represented as follows:
1. First, calcium hydroxide reacts with CO2:
\[ \text{Ca(OH)}_2 + \text{CO}_2 \rightarrow \text{CaCO}_3 + \text{H}_2\text{O} \]
This reaction produces calcium carbonate (CaCO3), which is the white precipitate observed.

2. When excess CO2 is bubbled through the solution, the calcium carbonate reacts with CO2 and water to form calcium bicarbonate:
\[ \text{CaCO}_3 + \text{CO}_2 + \text{H}_2\text{O} \rightarrow \text{Ca(HCO}_3\text{)}_2 \]
Calcium bicarbonate is soluble in water, which explains why the solution becomes clear after the initial precipitation.

### Step 3: Conclusion
Both the assertion and the reason are correct. The reason correctly explains the assertion because the formation of calcium bicarbonate from calcium carbonate is what leads to the dissolution of the precipitate.

### Final Answer
The correct option is: **Option A: Both assertion and reason are correct and reason is the correct explanation for the assertion.**

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