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Q.

Which of the following is transition element

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a

Pb

b

Sn

c

Cr

d

Zn

answer is C.

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Detailed Solution

Pb= [Xe] 4f145d106s26p2

Sn = [Kr]4d105s25p2

Cr= [Ar]3d54s1

Zn=  [Ar]3d104s2

From the above configurations, only 'Cr' has partially filled d-orbitals. Hence it is the transition element.

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