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a) Lemon and tamarind contain citric and tartaric acid respectively which react with the metal and make it shining.
b)ionic compounds have strong inter molecular attraction among particles which makes these compounds stronger. So a lot of energy is required to break this bond. Therefore it has high melting point.
c) Sodium is a highly reactive metal which vigorously react with oxygen or water to produce heat.So it is kept in kerosene to break the contact with air and moisture.
d)Pine oil attracts the impurities from the ore so it is used in froath floating
e)The anodes get oxidized and it is made of carbon.So it should be replaced during electrolysis of alumina.
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