Chemistry
Grade-8
Easy
Question
The compound which is used as a grinding stone to cut and sharpen tools is:
- Calcium dioxide
- Silicon tetrachloride
- Silicon carbide
- Aluminium phosphate
Hint:
It is an artificial carbon compound.
The correct answer is: Silicon carbide
The correct option is c)Silicon carbide.
Silicon carbide, an artificial compound of silicon and carbon with a Mohs hardness of 9.5, is commonly used to cut softer gemstones. It is also used as a grinding stone to cut and even to sharpen tools. Diamond, the hardest natural substance, has a Mohs hardness of 10 and is used as an abrasive for cutting and polishing a variety of materials, including diamond itself.
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