'Metals are usually not found as nitrates in their ores''. Out of the following two (I`andII`) reasons which is//are true for the above obervation?
`I`.Metal nitrates are highly unstable.
`II.` Metal nitrates are highly soluble in water.

Options

A. I and II are true
B. I and II are false
C. I is false but II is true
D. I is true but II is false

Explanation

To solve the question, we need to analyze the two given statements regarding why metals are usually not found as nitrates in their ores.

### Step-by-Step Solution:

1. **Understanding the Statement**: The statement we are analyzing is that "metals are usually not found as nitrates in their ores." We need to determine if the reasons provided (I and II) are true or false.

2. **Analyzing Reason I**:
- **Statement I**: "Metal nitrates are highly unstable."
- **Evaluation**: Metal nitrates, such as potassium nitrate (KNO3) and sodium nitrate (NaNO3), are known to be stable compounds. They do not decompose easily under normal conditions. Therefore, this statement is **false**.

3. **Analyzing Reason II**:
- **Statement II**: "Metal nitrates are highly soluble in water."
- **Evaluation**: Many metal nitrates are indeed highly soluble in water. This solubility means that when it rains, these nitrates can dissolve and be washed away into water bodies, rather than remaining in the soil to form ores. Hence, this statement is **true**.

4. **Conclusion**: Based on the evaluations:
- Reason I is false (metal nitrates are stable).
- Reason II is true (metal nitrates are highly soluble in water).
- Therefore, the correct answer is that only the second reason is true.

### Final Answer:
- **I**: False
- **II**: True
- The answer is that the first reason is false, and the second reason is true.