(A) The $Cu^{2+}$ ion in aqueous solution exists as the hydrated complex $[Cu(H_2O)_6]^{2+}$.Due to the presence of one unpaired electron in the $d$-o

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(A) The $Cu^{2+}$ ion in aqueous solution exists as the hydrated complex $[Cu(H_2O)_6]^{2+}$.Due to the presence of one unpaired electron in the $d$-orbital,$d-d$ transitions occur when light is absorbed.The absorption of energy from the visible region results in the transmission of the complementary colour,which is blue.