Which of the following compounds/alloys of silicon in used in grinding wheel and which property of that substance is exploited ?

Options

A. Silicon carbide because it is the hardest substance.
B. Ferrosilicon because it is resistant to friction.
C. Sodium silicate because it becomes impervious when heated strongly.
D. Silicon dioxide because it is resistant to chemicals.

Explanation

**Step-by-Step Solution:**

1. **Identify the Compounds/Alloys of Silicon**: The first step is to recognize the different compounds or alloys of silicon that are commonly used in various applications. In this case, we are specifically looking for those used in grinding wheels.

2. **Determine the Suitable Compound for Grinding Wheels**: Among the various silicon compounds, silicon carbide (SiC) is known for its hardness and is commonly used in grinding wheels.

3. **Understand the Properties of Silicon Carbide**: Silicon carbide is recognized as one of the hardest substances available. This property of hardness is crucial for the effectiveness of grinding wheels, as they need to cut through or grind down materials.

4. **Conclude the Answer**: Based on the information gathered, the compound used in grinding wheels is silicon carbide, and the property that is exploited is its hardness.

**Final Answer**: Silicon carbide (SiC) is used in grinding wheels, and the property exploited is its hardness.

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