Chemistry
State the reasons for
(a) Use of diamond - as an item of jewellery.
(b) 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.
Carbon
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Answer
(a) Diamond has a sparkling brilliance due to high refractive index hence, it is used as the most precious & expensive item of jewellery.
(b) (i) Ordinary lubricating oils gets charred due to high temperature whereas graphite is non-volatile and non-sticky and can withstand high temperatures.
(ii) Graphite can withstand very high temperature as it has a high melting point and is a good conductor of heat. So it is used as a lining for crucibles used in manufacture of high grade steel.
(iii) Graphite is a good conductor of electricity and is relatively inert. Chemically it is almost inactive with acids hence is used as an electrode in electroplating.
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