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a) Graphite is used as an lubricant to r...

a) Graphite is used as an lubricant to reduce friction in certain parts of the engines which become very hot while working. Which property of graphite is made use of here.
b) Carbon has the ability to combine together. Which property help the carbon to combine together?

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a) Graphite is a smooth solid. It does not vapourise it also has high melting point. Hence it is used as a lubricant to reduce friction in machine parts which become extremely hot.
b) catenation
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