Chemistry - Complete d-block Question with Solution | TestHub

Statement (D) is incorrect because in the d-block, higher oxidation states are favored by heavier elements at the bottom of a group, not the lighter ones. For example, in Group 6, molybdenum and tungsten form stable Mo(VI) and W(VI) compounds, whereas chromium Cr(VI) is a strong oxidizing agent and less stable.

Conversely, in p-block elements (Statements B and C), the inert pair effect stabilizes the lower oxidation states by two units in heavier members (e.g., Pb²⁺ is more stable than Pb⁴⁺).

Statement (A) is correct as d-block elements commonly exhibit variable oxidation states differing by unity (e.g., Fe²⁺ and Fe³⁺).