Due to boiling of the impure or hard water we observe some settle water, what it may be?

Options

A. Bicarbonate of calcium
B. Bicarbonate of magnesium
C. Both (1) and (2)
D. Neither (1) nor (2)

Explanation

### Step-by-Step Solution:

1. **Understanding Hard Water**: Hard water contains dissolved minerals, primarily calcium and magnesium ions, often in the form of bicarbonates. These minerals make the water "hard" and can lead to scale formation when heated.

2. **Boiling Hard Water**: When hard water is boiled, the heat causes the bicarbonates of calcium and magnesium to decompose. This process results in the formation of insoluble carbonates.

3. **Formation of Settled Water**: As a result of boiling, the bicarbonates convert to carbonates, which are less soluble in water. This leads to the precipitation of calcium carbonate (CaCO₃) and magnesium carbonate (MgCO₃), which settle at the bottom of the container.

4. **Identifying the Settled Substance**: After boiling, the settled material primarily consists of these carbonates, not the original bicarbonates. Therefore, the settled water does not contain significant amounts of bicarbonate of calcium or bicarbonate of magnesium.

5. **Conclusion**: Since the settled water does not contain either bicarbonate of calcium or bicarbonate of magnesium after boiling, the correct answer to the question is that it is "neither one nor two."

### Final Answer:
The correct option is **C: Neither one nor two**.

---