Assertion :Graphite cannot be converted into diamond. Reason: Graphite is conducting in nature.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. Diamond is stable upto 15000C in vacuum but at 18000C−20000C, it converts into graphite. From figure it can be seen that, in graphite, since pi-electrons are free to move throughout the entire layers so graphite is a good conductor ofelectricity. Its conductivity increases with temperature.