Assertion : 22 carat gold is a compound.
Reasons : A compound has fixed composition of the elements present in it.

Options

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

Answer

To analyze the given assertion and reason, we will break down the concepts of compounds and mixtures, specifically in relation to 22 carat gold.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "22 carat gold is a compound."
- To evaluate this, we need to understand what 22 carat gold is.

2. **Definition of 22 Carat Gold**:
- 22 carat gold is an alloy, which means it is a mixture of gold and other metals (usually copper or silver). It contains 91.67% gold and 8.33% other metals.
- Since it is composed of different metals that are not chemically bonded together, it is not a compound.

3. **Understanding the Reason**:
- The reason states that "a compound has a fixed composition of the elements present in it."
- This statement is true. A compound is defined as a substance formed when two or more elements are chemically bonded together in a fixed ratio.

4. **Evaluating the Assertion and Reason**:
- Since the assertion is incorrect (22 carat gold is not a compound, but a mixture), and the reason is correct (compounds do have a fixed composition), we conclude that the assertion is false while the reason is true.

5. **Conclusion**:
- The correct answer is that the assertion is false, and the reason is true.

### Final Answer:
- The assertion "22 carat gold is a compound" is **false**.
- The reason "a compound has fixed composition of the elements present in it" is **true**.