CBSE 12 Chemistry · U4
d- and f-Block Elements
Position, electronic configuration, transition-element properties, important compounds, lanthanoids, actinoids, and applications of d- and f-block elements. Theory weightage: 7 marks.
Test yourself
A focused, distraction-free run through 25 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 4.1
Position and Electronic Configuration
Location of d- and f-block elements, transition-element definition, and exceptional first-series configurations.
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Topic 4.2
General Properties of Transition Elements
Variable oxidation states, colour, magnetic behaviour, catalysis, alloy formation and interstitial compounds.
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Topic 4.3
Important Compounds of Transition Elements
Chromate-dichromate equilibrium, potassium dichromate, potassium permanganate and their oxidising actions.
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Topic 4.4
Lanthanoids
Electronic configuration, common oxidation states, lanthanoid contraction and its consequences.
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Topic 4.5
Actinoids and Applications of d- and f-Block Elements
Actinoid electronic features, comparison with lanthanoids, radioactivity, and important applications.
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