___ acts as a lubricant at higher temperatures.

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Solution

Graphite is soft and acts as a lubricant at higher temperatures. It is a good conductor of heat and electricity. It is known as black lead and is obtained as minerals in Ceylon, Siberia, Austria, California and India. Extensive amount of graphite is additionally made from coke or anthracite in electric furnaces. It is an allotrope of carbon.

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___ allotrope of carbon acts as a lubricant at high temperatures.

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