The metals that cannot be obtained by electrolysis of an aqueous solution of its salt is:

I) Ca

ii)Cu

iii)Cr

iv)Ag

(i) Aqueous solution of calcium chloride upon electrolysis give calcium hydroxide because calcium metal reacts with water to produce calcium hydroxide.
Hence, option (i) is correct.

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i)Ca because while its electrolysis H2 gas is evolved at Cathode.

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