Question

(i) There are four d-block series.
(ii) Total d-block elements are 40.
(iii) Last d-block series starts with element actinium.
(iv) All members of d-block series are transition metal.
The correct statements are :

• A. (i) and (v)
• B. (i), (ii) and (iii)
• C. (i) and (iii)
• D. All

Answer 1

The correct option is B (i), (ii) and (iii)

Elements of four rows (4,5,6 and 7) and group 3 to 12 are called transition elements.
Each row has 10 transition elements and totally 40 elements.
Transtion elements of 6th and 7th row starts with Lanthanum and Actinium respectively.
Fourteen elements following them are knowns as Lanthanoids and Actinoids respectively and placed seperately knowns as inner transition metal.

All transition elements are d-block elements, but all d-block elements are not transition elements.
Zn, Cd and Hg of group 12 have full $d^{10}$ configuration in their ground state as well as in their common oxidation states.​ Thus, they are non-transition metal.
option a, is the correct answer