Which metal is purified by the method of liquation?

Which metal reacts with cold water violently?

Why should metal sulphides and carbonates be converted to metal oxides during the process of metal extraction?

Give reasons for the following:
$(i)$ Most metals conduct electricity well.
$(ii)$ The reaction of iron $(III)$ oxide,$Fe_{2}O_{3}$,with heated aluminium is used to join cracked machine parts.
$(iii)$ Sodium,potassium,and lithium are stored under oil.

When sulfur dioxide gas is passed through lime water,which insoluble substance is formed that turns the solution milky?

When finely powdered ore is placed on a rotating grooved table and rotated rapidly,the lighter impurities are removed. What is this method of concentration called?