d- and f-Block Elements · Class 12 Chemistry · Chapter 4
⚗️ d- and f-Block Elements
CBSE Class 12 Science · Chemistry · Chapter 1
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📖Notes Deck
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Download PDF →Top question patterns · CBSE annual / SQP aggregate
| 85% | Spin-only magnetic moment of a given ion — Write ion config, remove ns first, count unpaired n, apply sqrt(n(n+2)). State BM. | 2 MARKS |
| 80% | Lanthanide contraction: define + cause + two consequences — Decrease in size; poor 4f shielding; consequences = Zr/Hf similarity + decreasing basicity of hydroxides. | 3 MARKS |
| 75% | KMnO4 / K2Cr2O7 preparation and oxidising-action equations — Memorise acidic half-reactions (Mn +7->+2 / Cr +6->+3) and balance with H^+ and H2O. | 3 MARKS |
| 70% | Reason-type: colour / variable states / catalytic property — Colour = d-d transition; variable states = close (n-1)d/ns energies; catalysis = variable states + large surface. | 2 MARKS |
| 60% | Lanthanides vs actinides comparison — Actinides: wider oxidation states, all radioactive, greater contraction. Lanthanides: mostly +3. | 2 MARKS |
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