Q.32.Give reason for the following:
(1) Most metals conduct electricity well.
() The reaction of iron (III) oxide, Fe2O3 with heated aluminium is used to join cracked
machine parts
(11) Sodium, potassium and lithium are stored under oil.
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1)most metals have low resistivity and all metals are conductors of electrical energy
2)Ans: Thermite reaction is used to join cracked iron parts of machines. A mixture of iron oxide Fe2O3 (rust) and aluminum powder. When it is ignited the aluminum powder reacts with the O3 part of the rust in a highly exothermic reaction, the resulting product is molten iron
3)Sodium potassium and lithium are stored under oil to prevent their reaction with oxygen moisture and carbon dioxide of air so as to protect them as they are highly reactive metals.
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