Which of the following is correct

Options

A. All carbonates are soluble in water
B. Carbonates of Na,K, and `NH_(4)` are soluble in water
C. Carbonates of `Ca,Sr,` Ba are soluble in water
D. All carbonatse are insoluble

Explanation

To solve the question regarding the solubility of carbonates, we will analyze each option provided in the question step by step.

### Step 1: Analyze the options
We have four statements regarding the solubility of carbonates:
1. All carbonates are soluble in water.
2. Carbonates of sodium, potassium, and NH4 are soluble in water.
3. Carbonates of calcium, strontium, and Ba are soluble in water.
4. All carbonates are insoluble.

### Step 2: Evaluate each statement
- **Statement 1**: "All carbonates are soluble in water."
- This statement is incorrect. Not all carbonates are soluble in water; many are insoluble.

- **Statement 2**: "Carbonates of sodium, potassium, and NH4 are soluble in water."
- This statement is correct. The carbonates of alkali metals (sodium, potassium) and ammonium (NH4) are indeed soluble in water.

- **Statement 3**: "Carbonates of calcium, strontium, and Ba are soluble in water."
- This statement is partially correct. While calcium, strontium, and barium carbonates are more soluble than many other carbonates, they are not highly soluble; they are considered slightly soluble.

- **Statement 4**: "All carbonates are insoluble."
- This statement is incorrect. As mentioned, some carbonates are soluble, particularly those of alkali metals and ammonium.

### Step 3: Conclusion
From the evaluation, the only correct statement is:
- **Statement 2**: "Carbonates of sodium, potassium, and NH4 are soluble in water."

### Final Answer
The correct option is **Statement 2**.

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