In which of the following 'd' subshells are degenerate?
A
Cu2+aq
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B
Fe2+aq
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C
Fe3+aq
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D
Cu1+aq
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Solution
The correct option is DCu1+aq The electronic configuration of Cu1+ is 1s22s22p63s23p63d104s0. The 3d orbital is completely filled, hence it is degenerate. In all other cases, there is one or more than one vacant space in the d orbital which makes it generated.