A : Anhydride of carbonic acid is `CO_(2)` .
R : Carbonic acid is dibasic .

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2)
C. If Assertion is true statement but Reason is false , then mark (3)
D. If both Assertion and Reason are false statements , then mark (4)

Answer

To solve the question, we need to analyze both the assertion (A) and the reason (R) provided in the statement.

### Step 1: Analyze the Assertion (A)
The assertion states that the anhydride of carbonic acid is CO₂.

- **Explanation**:
Carbonic acid (H₂CO₃) can be represented as having the formula H₂CO₃. An anhydride is formed when water (H₂O) is removed from an acid. In the case of carbonic acid, if we remove two hydrogen atoms and one oxygen atom (which constitutes water), we are left with CO₂. Therefore, the assertion is correct.

### Step 2: Analyze the Reason (R)
The reason states that carbonic acid is dibasic.

- **Explanation**:
A dibasic acid is one that can donate two protons (H⁺ ions). In the case of carbonic acid (H₂CO₃), it has two replaceable hydrogen ions. This means that it can dissociate to release two protons, making it a dibasic acid. Therefore, the reason is also correct.

### Step 3: Determine the Relationship Between A and R
Now we need to determine if the reason correctly explains the assertion.

- **Explanation**:
While both statements are true, the reason does not explain why CO₂ is the anhydride of carbonic acid. The assertion is based on the removal of water from carbonic acid, while the reason discusses the basicity of carbonic acid. Thus, the reason does not provide a justification for the assertion.

### Conclusion
Both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.

### Final Answer
The correct option is: Both A and R are true, but R is not the correct explanation of A.

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