Class 12 Chemistry: d and f Block Elements

Which of the following elements exhibits the maximum number of oxidation states?

The lanthanoid contraction is responsible for the fact that:

Which of the following statements about interstitial compounds is INCORRECT?

KMnO₄ acts as an oxidizing agent in acidic, alkaline, and neutral media. Which of the following statements is true about its oxidizing action?

Which of the following pairs has both elements with a +3 oxidation state as their most common oxidation state?

The general electronic configuration of the d-block elements is ____________.

The highest oxidation state of osmium is ____________.

The colour of transition metal ions is generally attributed to ____________ transitions.

Explain why Zinc (Zn) is considered a d-block element but not a transition element.

Account for the increase in stability of the +2 oxidation state from Fe to Zn in the first transition series.