Give reason: (i) metals are regarded as electropositive metals. (ii) aluminium which is more reactive than iron does not corrode like iron. (iii) when a piece of copper metal is added to a solution of zinc sulphate , no change takes place, but the blue colour of copper sulphate fades away when a piece of zinc is placed in its solution. (iv) aluminium cannot be extracted by using carbon as a reducing agent. (v) ionic compounds in in solid state do not conduct electricity and they do so in molten state . (vi) when calcium is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to wire catches fire.
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