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Question

Which of the following form of coal is used as a lubricant?

A
Anthracite
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B
Peat
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C
Bituminous
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D
Graphite
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Solution

The correct option is C Graphite
Graphite is a form of coal and is the most stable form of carbon under standard conditions. It is used in making pencils and lubricants.
So, the correct answer is 'Graphite'

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