STATEMENT -1 : `H_(3)PO_(4)` is a tribasic acid.
and
STATEMENT -2 : In `H_(3)PO_(4)`, only two H-atoms are replaceable.

Options

A. Statement -1 is True, Statement -2 is True, Statement -2 is a correct explanation for Statmenet -1.
B. Statement -1 is True, Statement -2 is True, Statement-2 is NOT a correct explanation for Statement -1
C. Statement -1 is True, Statement -2 is False
D. Statement -1 is False, Statmenet -2 is True

Answer

To solve the question, we need to analyze both statements regarding the compound \( H_3PO_4 \) (phosphoric acid).

### Step-by-Step Solution:

1. **Understanding Basicity**:
- The basicity of an acid refers to the number of hydrogen ions (\( H^+ \)) that can be released when the acid dissociates in solution.
- For \( H_3PO_4 \), it can release three \( H^+ \) ions upon complete dissociation.

2. **Evaluating Statement 1**:
- Statement 1 claims that \( H_3PO_4 \) is a tribasic acid.
- Since \( H_3PO_4 \) can produce three \( H^+ \) ions, this statement is **true**.

3. **Evaluating Statement 2**:
- Statement 2 claims that in \( H_3PO_4 \), only two hydrogen atoms are replaceable.
- However, as established, all three hydrogen atoms in \( H_3PO_4 \) can be replaced (or released as \( H^+ \) ions).
- Therefore, Statement 2 is **false**.

4. **Conclusion**:
- Statement 1 is true, and Statement 2 is false.

### Final Answer:
- Statement 1 is true, and Statement 2 is false.