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An Intiative by Sri Chaitanya
a
promotion of 3d-electrons of the central atom/ion o 4s-orbital
b
promotion of 3d-electrons of the central atom/ion to 4p-orbitals.
c
promotion of 3d-electrons of the central atom/ion with in d-orbitals
d
promotion of 4s-electrons of the central atom/ion to 4p-orbitals.
answer is C.
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