The economical and high melting point compound used in furance lining is

Options

A. PbO
B. CaO
C. HgO
D. ZnO

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks for a compound that is economical and has a high melting point, specifically used in furnace lining.

2. **Identifying Characteristics**: The compound must have:
- A high melting point.
- Be cost-effective or economical.
- Be suitable for use in furnace linings.

3. **Researching Suitable Compounds**: Common compounds used in furnace linings include various oxides, but we need to focus on those that meet the criteria of high melting point and affordability.

4. **Identifying Calcium Oxide**: Calcium oxide (CaO), also known as quicklime, is known for its high melting point of approximately 2572 degrees Celsius.

5. **Evaluating Economic Factors**: Calcium oxide is widely available and relatively inexpensive compared to other high melting point materials.

6. **Conclusion**: Based on the characteristics and evaluation, calcium oxide (CaO) is the compound that fits all the criteria mentioned in the question.

7. **Final Answer**: The economical and high melting point compound used in furnace lining is **calcium oxide (CaO)**.

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