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Furances are lined with calcium oxide as...

Furances are lined with calcium oxide as

A

It gives light on heating

B

It is refractory and basic

C

It is not affected by acids

D

It gives `O_(2)` on heating

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Purpose of Furnaces:** - Furnaces are used in metallurgical processes such as smelting and roasting, where high temperatures are required to extract metals from their ores. 2. **Material Used for Lining:** - Calcium oxide (CaO) is used to line furnaces. This is important because the lining material must withstand high temperatures without degrading. 3. **Properties of Calcium Oxide:** - Calcium oxide is classified as a refractory material, meaning it can withstand high temperatures without melting or breaking down. - Additionally, calcium oxide is a basic oxide, which means it can react with acidic impurities that may be present in the ores being processed. 4. **Conclusion:** - Therefore, the reason furnaces are lined with calcium oxide is that it is both refractory (able to withstand high temperatures) and basic (able to neutralize acidic impurities). **Final Answer:** Furnaces are lined with calcium oxide because it is refractory and basic. ---
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