Solutions · Class 12 Chemistry · Chapter 1
🧪 Solutions
CBSE Class 12 · Chemistry · Chapter 1
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Six free PDFs + an editable PPTX cover every angle of this chapter — read the deck, drill the MCQs, sit the full board paper, then check against the marking scheme.
📖Notes Deck
Full lecture deck with motifs, misconception red-boxes, and Hindi glossary. Read this first.
Download PDF →📝Quick Drill
15 PYQ-tagged MCQs with year + set + marks + per-Q time budget. Drill under 20-min timer.
Download PDF →📄Board Paper
Full CBSE-pattern paper with 4 sections. Sit it closed-book before checking the marking scheme.
Download PDF →✅Marking Scheme + Topper Templates
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Download PDF →⚡Cheat Sheet
1-page exam-day card: formulas, top PYQ patterns, 90-minute revision flow.
Download PDF →👨👩👧For Parents
1-page plain-language parent guide: what's being learned + questions to ask your child.
Download PDF →Top PYQ patterns · CBSE 2017–2024 aggregate
| 90% | Find molar mass from FP depression / BP elevation data — Use M = (1000·K·w) / (ΔT·W). Watch units (mass in g, K in K·kg/mol). | 5 MARKS |
| 70% | State Raoult's law, distinguish ideal vs non-ideal — P_A = x_A·P_A°. Examples: n-hexane+n-heptane (ideal), ethanol+water (+ve dev), HNO₃+water (−ve dev). | 3 MARKS |
| 65% | Calculate osmotic pressure — π = MRT. T in K. R = 0.0821 L·atm/mol/K. | 3 MARKS |
| 50% | Henry's law gas-solubility numerical — p = K_H·x. Solve for x_gas, convert to molality if asked. | 3 MARKS |
| 45% | van't Hoff factor for dissociation/association — i > 1 for dissociation, i < 1 for association. Apply: ΔT = i·K·m. | 3 MARKS |
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