chemistry

name	chemistry
description	CBSE Grade 12 Chemistry — Full Syllabus Mastery (2026-27). Covers Physical, Inorganic, and the 33-mark Organic giant. Target: 70/70 Theory + 30/30 Practical.

Chemistry — CBSE Grade 12 (PCMB/PCMC)

Syllabus Blueprint (2026–27)

Unit	Chapters	Marks
Physical	Solutions, Electrochemistry, Chemical Kinetics	23
Inorganic	d- and f- Block Elements, Coordination Compounds	14
Organic	Haloalkanes, Alcohols, Aldehydes, Amines, Biomolecules	33
Total	10 Chapters	70

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Unit I: Physical Chemistry (23 Marks)

Key Concepts

• Solutions: Raoult's Law, Ideal/Non-ideal solutions, Colligative properties (Elevation in BP, Depression in FP, Osmotic Pressure), van't Hoff factor.
• Electrochemistry: Nernst Equation, Conductivity, Molar Conductivity, Kohlrausch's Law, Faraday's Laws, Fuel cells, Corrosion.
• Kinetics: Rate of reaction, Order/Molecularity, Integrated rate equations (Zero and First order), Half-life, Arrhenius Equation.

Key Formulas

Raoult's Law: P = P^o \chi
Elevation in BP: \Delta T_b = i K_b m
Depression in FP: \Delta T_f = i K_f m
Osmotic Pressure: \pi = i CRT
Nernst Eq: E_{cell} = E^o_{cell} - \frac{0.0591}{n} \log Q
Molar Conductivity: \Lambda_m = \frac{\kappa \times 1000}{M}
First Order Rate: k = \frac{2.303}{t} \log \frac{[R]_0}{[R]}
Half-life (1st order): t_{1/2} = \frac{0.693}{k}
Arrhenius: \log \frac{k_2}{k_1} = \frac{E_a}{2.303R} \left( \frac{1}{T_1} - \frac{1}{T_2} \right)

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Unit II: Inorganic Chemistry (14 Marks)

Key Concepts

• d- and f- Block: Electronic configuration, Transition metal properties (Colored ions, Catalytic property, Alloy formation), Lanthanoid contraction.
• Coordination Compounds: Werner’s theory, IUPAC nomenclature, VBT (Hybridization/Magnetic moment), CFT (Crystal field splitting), Isomerism.

High-Yield Facts

• KMnO4 / K2Cr2O7: Preparation and oxidizing properties (Structure is high-yield).
• VBT: Identifying Inner/Outer orbital complexes (e.g., $[Co(NH_3)_6]^{3+}$ vs $[CoF_6]^{3-}$).
• CFT: Strong field vs Weak field ligands (Spectrochemical series).

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Unit III: Organic Chemistry (33 Marks) - The Giant

1. Named Reactions (The Topper's Core)

• Haloalkanes: Finkelstein, Swarts, Wurtz-Fittig, Sandmeyer.
• Alcohols/Phenols: Reimer-Tiemann, Kolbe’s reaction, Williamson Synthesis.
• Aldehydes/Ketones: Rosenmund, Stephen, Etard, Clemmensen, Wolff-Kishner, Aldol, Cannizzaro.
• Amines: Hoffmann Bromamide, Gabriel Phthalimide.

2. Distinction Tests (Section C/D)

• Lucas Test: Primary (slow), Secondary (5 min), Tertiary (immediate turbidity).
• Tollens' / Fehling's: Aldehydes (Positive) vs Ketones (Negative).
• Iodoform Test: Methyl ketones and alcohols with $CH_3-CH(OH)-$ group.
• Hinsberg’s Test: Distinction between 1°, 2°, and 3° amines.

3. Mechanisms (High-Frequency 3-Markers)

1. SN1 vs SN2: Nucleophilic substitution in haloalkanes.
2. Dehydration of Ethanol: To Ethene ($443K$) or Ethoxyethane ($413K$).
3. Acid-catalyzed hydration of Alkenes.
4. Nucleophilic Addition to Carbonyl groups.

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Unit IV: Biomolecules (7 Marks)

• Carbohydrates: Glucose (Structure/Reactions), Glycosidic linkage.
• Proteins: Amino acids, Peptide linkage, Denaturation.
• Nucleic Acids: DNA vs RNA, Nucleosides vs Nucleotides.

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High-Yield Strategy (Target 495+)

1. Physical: Master the numericals from Nernst Equation and First Order Kinetics.
2. Inorganic: Learn the IUPAC rules and CFT logic for Coordination compounds.
3. Organic: Create a "Reaction Map". 5 marks usually come from "Conversion" or "Roadmap" questions ($A \to B \to C$).
4. Graph Analysis: Study the graphs for Zero/First order reactions and Vapour pressure.

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Common Board Exam Traps

• Sign Conventions: $E^o_{cell}$ calculation errors (Cathode - Anode).
• Conversions: Forgetting to change units in Colligative property numericals ($g$ to $kg$).
• Reagents: Confusing $LiAlH_4$ (strong reducer) with $NaBH_4$ (mild).
• IUPAC: Forgetting the alphabetical order of ligands in coordination naming.

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Answer Writing Framework

1. Physical: State formula $\to$ Substitute with units $\to$ Final Answer boxed.
2. Inorganic: Use clear reasoning (e.g., "Due to d-d transition" or "Lanthanoid contraction").
3. Organic: Write the full equation with the Reagent on the arrow. If asked for a mechanism, show the Curly Arrows.

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Internal Assessment (30 Marks)

• Volumetric Analysis: Titration of KMnO4 (8M).
• Salt Analysis: Identification of Cation/Anion (8M).
• Viva: Be ready for "End point" and "Confirmatory test" logic.