d- and f-Block Elements (Class 12)
Transition metals, lanthanoids, actinoids — properties, oxidation states, complex formation.
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Take a full mock →Q1 · d- and f-Block Elements (Class 12) · EASY
Which of the following transition metal ions has the highest number of unpaired electrons in its d-orbitals?
Q2 · d- and f-Block Elements (Class 12) · MEDIUM
The lanthanoid contraction is responsible for which of the following observations?
Q3 · d- and f-Block Elements (Class 12) · HARD
Chromium metal dissolves in dilute hydrochloric acid to give a blue solution which turns green on standing. The blue colour is due to [Cr(H₂O)₆]²⁺ and the green colour is due to a mixture of complexes. Which of the following best explains the change in colour?
Q4 · d- and f-Block Elements (Class 12) · EASY
Which of the following elements shows a maximum number of different oxidation states in its compounds?