General introduction, electronic configuration, occurrence and characteristics of transition elements; trends in metallic character, atomic and ionic sizes, ionisation enthalpy, oxidation states; coloured ions, magnetic properties, catalytic property, alloy formation; preparation and properties of K2Cr2O7 and KMnO4; lanthanoids and actinoids — electronic configurations, oxidation states, lanthanoid contraction.
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Q1 · d- and f-Block Elements · EASY
Which of the following electronic configurations represents a transition element?
Q2 · d- and f-Block Elements · MEDIUM
The lanthanoid contraction is responsible for which of the following observations?
Q3 · d- and f-Block Elements · MEDIUM
In acidic medium, potassium dichromate (K2Cr2O7) oxidizes ferrous ions to ferric ions. What is the change in oxidation state of chromium in this reaction?
Q4 · d- and f-Block Elements · MEDIUM
Which transition metal ion exhibits the highest magnetic moment among the following? (Atomic numbers: Ti = 22, V = 23, Cr = 24, Mn = 25)
Q5 · d- and f-Block Elements · HARD
A compound of a d-block element shows the following properties: (i) it is diamagnetic, (ii) it has square planar geometry, (iii) it exhibits dsp2 hybridization. Which of the following complexes best fits this description?