Assertion (A) : Washing soda `(Na_(2)CO_(3))` is a compounds.
Reason (R ) : Sodium retains its property in washing soda.

Options

A. Both A and R are true and R is the correct explanation for A.
B. Both A and R are true but R is not the correct explanation for A.
C. A is true and R false.
D. A is false and R is true.

Explanation

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

### Step 1: Understand the Assertion
- **Assertion (A)** states that washing soda `(Na₂CO₃)` is a compound.
- A compound is a substance formed when two or more elements are chemically bonded together. In this case, washing soda is indeed a compound made up of sodium (Na), carbon (C), and oxygen (O).

### Step 2: Understand the Reason
- **Reason (R)** states that sodium retains its property in washing soda.
- In a compound, the individual elements do not retain their original properties. For instance, sodium is a highly reactive metal, but in washing soda, it does not exhibit the same reactivity. Instead, it behaves differently due to the chemical bonding with carbon and oxygen.

### Step 3: Analyze the Truth of Each Statement
- The assertion (A) is **true** because washing soda is indeed a compound.
- The reason (R) is **false** because sodium does not retain its properties when it forms a compound like washing soda.

### Conclusion
- Since the assertion is true and the reason is false, we conclude that the correct answer is that the assertion is true and the reason is false.

### Final Answer
- Assertion (A) is true; Reason (R) is false.

---