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The order of reactivity of some metais a...

The order of reactivity of some metais are given. Answer the following questions by analysing it.
Al gt Zn gt Cu gt Au
a) Which metal is produced by the electrolysis of its molen salt?
b) Matal occur in free state in nature.
c) Metal produced by the self oxidation-reduction reaction.
d) Metal are which is reduced by carbon.

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i) Froth floatation
ii) Magnetic separation
iii) Leaching
Iv) Levigation
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