Explanation
Because H has positive charge.
Because H2O is used as electrolyte.
Positive ions get deposited on cathode
Electroplating only provides a thin deposition of a metal on the surface which is no way can give hardness to the metal.
The current through the voltameter is same as drawn from the battery outside it.
The resistance of the cell is independent of e.m.f.
Production of heat at junctions due to current is known as Peltier effect.
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