Sc (Z=21) is a transition element but Zn(Z=30) is not because

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both Sc3+ and Zn2+ ions are colourless and form white compounds.

in case of Sc, 3 d orbitals are partially filled but in Zn these are filled.

last electron is assumed to be added to 4 s level in case of Zn.

both Sc and Zn do not exhibit variable oxidation states.

answer is B.

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Detailed Solution

Sc (Z=21) has incompletely filled 3d-orbitals in its ground state 3d1, it is considered as a transition element but Zn(Z=30) has completely filled d -orbitals 3d10 in its ground state and its common oxidation state of (+2), it is not considered as a transition element.

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