Which of the following statement (s) is/are correct? A. The d-block of the periodic table contai...

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Which of the following statement (s) is/are correct?
A. The d-block of the periodic table contains the elements of the groups 3-12.
B. Transition metals are defined as metals which have incomplete \( d \) subshell either in neutral atom or in their ions.

C. Zinc, cadmium and mercury are regarded as transition metals.

D. The d-orbitals of the penultimate energy level of atoms receive electrons giving rise to four rows of the transition metals, i.e., \( 3 \mathrm{~d}, 4 \mathrm{~d}, 5 \mathrm{~d} \) and \( 6 \mathrm{~d} \).
(1) A, B and D
(2) Only A and D
(3) Only C
(4) B, C and D
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