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On what ground can you say that scandium...

On what ground can you say that scandium `(Z=21)` is a transition element but zinc `(Z=30)` is not?

A

Incompletely filled 3d orbitals in Sc

B

Coloured compounds

C

variable oxidation state

D

None of the above

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The correct Answer is:
A
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Common oxidation state of Scandium, a transition element is /are (At. No =21)

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