Chemistry

रसायन विज्ञान · IOE · BE/BArch Engineering Entrance

3 chapters · 22 questions in the paper · about 1 h of reading

0 / 3 chapters done

Physical Chemistry 9 questions in the paper · 21 min read · 5 figures
The syllabus asks for
- Chemical arithmetic: Dalton's theory, laws of stoichiometry, atomic and molecular mass, empirical and molecular formula, limiting reactant, Avogadro's hypothesis, equivalent masses
- States of matter: gaseous, liquid and solid states
- Atomic structure and periodic classification of elements
- Oxidation, reduction and equilibrium
- Volumetric analysis
- Ionic equilibrium, acid, base and salt
- Electrochemistry
- Energetics of chemical reactions, chemical kinetics, chemical bonding and shape of molecules
Key points
- Convert everything to moles first; the limiting reagent decides the yield.
- Quantum numbers fix orbitals: 2l+1 per subshell; cations lose 4s before 3d.
- Count oxidation-number change to find n-factor and equivalent mass.
- For acid–base mixtures find the excess; weak acids use √KaC; buffers use Henderson.
- One faraday = one equivalent; E^°cell is cathode minus anode.
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Inorganic Chemistry 6 questions in the paper · 16 min read · 4 figures
The syllabus asks for
- Non-metals: hydrogen, oxygen, ozone, water, nitrogen and its compounds, halogens, carbon, phosphorus, sulphur, noble gases and environmental pollution
- Metals: metallurgical principles, alkali metals, alkaline earth metals, coinage metals (copper, silver, gold)
- Extraction of metals: zinc, mercury, and iron compounds
Key points
- Each industrial process has one catalyst: Fe (Haber), Pt (Ostwald), V₂O₅ (Contact).
- Know the oxidation products of copper with dilute versus concentrated nitric acid.
- Roast sulphides, calcine carbonates, smelt oxides; slag is CaSiO₃.
- Group 2 carbonates and sulphates become more stable / less soluble down the group.
- SO₂ and NOₓ give acid rain; CFCs destroy ozone; CO₂ and CH₄ warm the planet.
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Organic Chemistry 7 questions in the paper · 17 min read · 3 figures
The syllabus asks for
- Introduction: fundamental principles, purification, nomenclature, structural isomerism, idea of reaction mechanism
- Hydrocarbons: alkanes, alkenes, alkynes, aromatic hydrocarbons
- Haloalkanes and haloarenes
- Alcohols, phenols and ethers
- Aldehydes, ketones, carboxylic acids and derivatives
- Nitro compounds and amines, aromatic and aliphatic
Key points
- Name by the principal group; count isomers carefully (C₅H₁₂ has 3).
- Markovnikov for HX; peroxide reverses HBr; ozonolysis cuts at C=C.
- SN1 follows carbocation stability; SN2 follows steric access.
- Only carbonyls with α-H do aldol; only those without do Cannizzaro.
- Lucas distinguishes 1°, 2°, 3° alcohols; iodoform needs CH₃CH(OH)– or CH₃CO–.
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