Question

Which of the following is neutral refractories material?

• A. SiO\(_2\)
• B. MgO
• C. CaO
• D. SiC

Hint:

Neutral refractories: SiC, Al\(_2\)O\(_3\), graphite → resist both acids and bases.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Refractory materials are substances that can withstand high temperatures without softening or melting. They are classified as acidic, basic, or neutral based on their chemical reactivity with slags.
Step 2: Detailed Explanation:
1. Acidic Refractories: These react with basic slags. Examples include Silica (\( \text{SiO}_{2} \)) and Alumino-silicates.
2. Basic Refractories: These react with acidic slags. Examples include Magnesia (\( \text{MgO} \)) and Lime (\( \text{CaO} \)).
3. Neutral Refractories: These do not react with either acidic or basic slags. Common examples include Graphite, Chromite, and Silicon Carbide (\( \text{SiC} \)).
From the given options, \( \text{SiC} \) (Carborundum) is a neutral refractory material.
Step 3: Final Answer:
The neutral refractory material is \( \text{SiC} \).