Statement I : Diamond is an insulator and graphite is a conductor.
Statement II : Diamond is used as abrasive and graphite as lubricant.

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Both statement I and Statement II are false

Statement I is false and Statement II is true

Both Statement I and Statement II are true

Statement I is true and Statement II is false

answer is B.

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Detailed Solution

→ Diamond is non conductor of electricity due to lack of unpairedelectrons
Where as graphite is good conductor of electricity due to the presence of decocalise electron in graphite
→ Diamond is extremely hard subtance hence it is used as abrasive
→ Where as graphite has layer like structure the layer are held by weak vander waal's force of attraction hence one layer slips over the other layer. Due to its slippery nature it is using lubricant.

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