3
Question
Assertion (A): Graphite is used as a lubricant.
Reason (R): It has strong covalent bonds in the sheet-like structure but weak force between its layers.
Assertion (A): Graphite is used as a lubricant.
Reason (R): It has strong covalent bonds in the sheet-like structure but weak force between its layers.
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Solution
The correct option is D Both A and R are true, and R is the correct explanation of A.
Graphite has layer structure. Each layer is a planar sheet, composed of hexagonal rings of carbon atoms, with 3 electrons of each atom involved in strong single bonds with three adjacent atoms of hexagonal ring. The extra electron makes a very weak bond with the adjacent layer. Thus, one layer can slide over another and thus, it can be used as a lubricant.
Hence, the correct answer is Option (a).
Graphite has layer structure. Each layer is a planar sheet, composed of hexagonal rings of carbon atoms, with 3 electrons of each atom involved in strong single bonds with three adjacent atoms of hexagonal ring. The extra electron makes a very weak bond with the adjacent layer. Thus, one layer can slide over another and thus, it can be used as a lubricant.
Hence, the correct answer is Option (a).
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