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

To solve the question regarding which compound or alloy of silicon is used in grinding wheels and which property is exploited, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compounds/Alloys of Silicon**:
- We need to consider common compounds and alloys of silicon. The most relevant ones include silicon carbide (SiC), silicon dioxide (SiO2), and various silicon alloys.

2. **Determine the Suitable Compound for Grinding Wheels**:
- Among the compounds mentioned, silicon carbide (SiC) is widely known for its use in grinding wheels due to its hardness and abrasive properties.

3. **Understand the Properties of Silicon Carbide**:
- Silicon carbide is recognized as one of the hardest materials available. Its hardness allows it to effectively grind and shape other materials.

4. **State the Exploited Property**:
- The property of silicon carbide that is exploited in grinding wheels is its hardness. This allows it to cut through and shape other materials efficiently.

### Final Answer:
The compound used in grinding wheels is **silicon carbide (SiC)**, and the property that is exploited is its **hardness**.

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