Master Transition & Inner Transition Elements PYQs – 12th HSC Chemistry | Agastya Classes
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The Transition & Inner Transition Elements chapter is one of the high-yield topics in 12th HSC Chemistry. Over recent years, board exams have repeatedly tested sections like oxidation states, magnetic moments, colour of ions, lanthanoid contraction, and preparation & uses of KMnO₄ and K₂Cr₂O₇. If you're preparing for the Maharashtra Board exam, practising Previous Year Questions (PYQs) from this chapter can significantly boost your score. This post will share trending topics, sample questions, and strategies to master this unit.
HSC Transition Elements PYQ
| Topic | Why It’s Important / What to Focus On |
|---|---|
| Oxidation states (Mn, Fe, Ce, Eu, Yb) | Be comfortable writing all possible oxidation states, and know which are stable. |
| Magnetic moment & Colour of ions | Understanding unpaired electrons, electron configuration; reasons for some ions being colourless (e.g. Ti⁴⁺, Zn²⁺). |
| f-Block / Lanthanoids & Actinoids | Lanthanoid contraction: causes, effects; electronic configurations; differences with actinoids. |
| KMnO₄ / K₂Cr₂O₇ preparation & uses | Industrial and lab methods, reaction steps, reduction-oxidation behaviour. |
| Metallurgy & Extraction | Blast furnace reactions, interstitial compounds, role of flux, etc. |
Inner Transition Elements Questions Board Exam
Sample PYQs You Must Practice
- Explain why salts of Ti⁴⁺ are colourless.
- Calculate spin-only magnetic moment of the divalent ion with atomic number 25.
- Distinguish between lanthanoids and actinoids in four points.
- Write reactions for preparation of potassium dichromate from chromite ore.
Strategy to Score High: How to Use PYQs Effectively
- Build your own PYQ set — Collect past 5 years + sample papers; classify questions by topic.
- Daily Revision — Focus on one subtopic daily (e.g. one day color of ions, next day f-block).
- Use diagrams / comparison tables — Especially for distinguishing lanthanoids vs actinoids, showing contraction, etc.
- Practice under timed condition — Especially MCQs and short answer questions. Also practise full descriptive answers.
- Check your answers vs model solutions — Mark your weak areas. Revise explanations, reactions, and electronic configurations properly.
Conclusion
Transition & Inner Transition Elements is a chapter that keeps giving in terms of score potential. With the right preparation—strong understanding, repeated practice, PYQs & model answers—you can master this topic. Agastya Classes is here with solved PYQ sets, revision sessions, and expert guidance to help you ace this subject.
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