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Question
State the reasons for use of graphite
(i) as a lubricant for heated machine parts,
(ii) as a lining for crucibles used in manufacture of high grade steel,
(iii) as an electrode in electroplating.
Solution
- Heavy machines which run very fast, when other lubricants are used catch fire, but graphite as lubricant when used parallel layers slide over one and other is non-volatile and non-sticky and reduces friction between rotating parts.
- Graphite is used in refractory crucibles as graphite can withstand high temperature is a good conductor of heat.
- Graphite as electrode in electroplating as graphite is good conductor of electricity relatively inert and almost does not react with acids.
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