Nitrates of all metals are

Options

A. Unstable
B. Coloured
C. Insoluble in water
D. Soluble in water

Answer

To answer the question "Nitrates of all metals are," we will analyze the options provided and determine the correct answer through a step-by-step approach.

### Step 1: Understanding Nitrates
Nitrates are the salts or esters of nitric acid containing the nitrate ion (NO₃⁻). When we refer to the nitrates of metals, we are talking about compounds formed when metals react with nitric acid.

**Hint:** Recall the chemical formula for nitrates and their general properties.

### Step 2: Analyzing the Options
We have four options to consider:
1. Unstable
2. Colored
3. Insoluble in water
4. Soluble in water

**Hint:** Think about the general properties of salts and how they behave in water.

### Step 3: Evaluating Each Option
- **Option 1: Unstable** - This option suggests that metal nitrates are unstable. However, most metal nitrates are stable under normal conditions. Therefore, this option is incorrect.

- **Option 2: Colored** - This option implies that metal nitrates are colored. In fact, most metal nitrates are typically colorless or white solids. Thus, this option is also incorrect.

- **Option 3: Insoluble in water** - This option states that metal nitrates are insoluble in water. This is not true, as most metal nitrates are soluble in water. Therefore, this option is incorrect.

- **Option 4: Soluble in water** - This option claims that metal nitrates are soluble in water. This is consistent with the known properties of nitrates. The hydration energy of nitrates is greater than their lattice energy, which allows them to dissolve in water.

**Hint:** Consider the solubility rules for ionic compounds in water.

### Step 4: Conclusion
Based on the analysis of the options, the correct answer is that nitrates of all metals are **soluble in water**.

### Final Answer
Nitrates of all metals are soluble in water.