1.

The ground state electronic configuration of Cu(29) is [Ar]3d^(10) 4s^(1) and not [Ar]3d^(0)4s^(2). This is indicated by the fact that

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Completely filled sub-shell configuration is more stable than one less filled sub-shell configuration.
Cu EXHIBITS +1 IONIC state besides `+2` STATES.
Copper turnings react with hot conc. `H_(2)SO_(4)` to evolve `SO_(2)(g)`rather than `H_(2)(g)`.
`Cu^(2+)` disproportionates in aqueous solution into `Cu^(2+)` and Cu.

Answer :B


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