Viraf J Dalal Chemistry Class 10 Textbook Solutions 2021

The Challenge: Different extraction processes (calcination, roasting, smelting) for different metals (Al, Fe, Zn, Cu). What the 2021 Solutions Provide:

Key Topics: Preparation of HCl gas (Kipp’s waste, laboratory method), fountain experiment, properties of HCl, aqua regia.

Typical Solutions Include:

The Pitfall: Students often memorize the trends (atomic size, ionisation potential) without understanding why they occur. The Solution Strategy:

Focus: Homologous series, Hydrocarbons, Functional groups.

Key Question Type: Distinction between Alkanes, Alkenes, and Alkynes. Solution:

Key Topics: Occurrence of metals, reactivity series, extraction processes (calcination, roasting, smelting, electrolytic reduction), corrosion and its prevention.

Typical Solutions Include:

Here are the most solution-demanding chapters and what to focus on:

| Chapter No. | Chapter Name | Tricky Topics | |-------------|----------------|----------------| | 1 | Periodic Table | Trends (ionization energy, atomic radius) | | 2 | Chemical Bonding | Electrovalent vs covalent, dot structures | | 3 | Study of Acids, Bases & Salts | Action of dilute HCl/H2SO4 (tables of observations) | | 4 | Analytical Chemistry | Flame tests, cation/anion identification | | 5 | Mole Concept & Stoichiometry | Numericals – GAY-LUSSAC’s law, vapour density | | 6 | Electrolysis | Faraday’s laws, preferential discharge | | 7 | Metallurgy | Aluminium extraction (Hall-Heroult process) | | 8 | Organic Chemistry | IUPAC naming, ethanol to ethanoic acid |