Correct among the following
a) All transition elements are d - block elements
b) All d-block elements are transition elements
c) Helium is a inert gas
d) Aluminium is a respresentative element

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all

a, c and d

b, c and d

a and c

answer is B.

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Detailed Solution

A transition metal is one that forms one or more stable ions which have incompletely filled d orbitals.

Hence, Zn , Cd & Hg are not transition elements but d-block elements.

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