Question (Dalal 2021, Ex 5C, Q12):
Calculate the volume of oxygen at STP required to burn 60 g of ethane (C₂H₆).
Solution:
Answer: 156.8 L of oxygen.
The textbook is divided into two main parts: Inorganic Chemistry and Organic Chemistry. Below is a summary of the key questions and standard answers typically found in the 2021 editions. viraf j dalal chemistry class 10 textbook solutions 2021
| Pitfall | How the 2021 Solutions Rescue You | | :--- | :--- | | Writing unbalanced equations | The solutions show hit-and-trial method and oxidation number method. | | Forgetting state symbols | Every reaction in the solution includes (g), (l), (s), (aq). | | Confusing "drying agent" vs "absorbent" | The analytical chemistry solutions provide a table (e.g., Conc. H2SO4 dries acidic gases; CaO dries basic gases). | | Miscalculating molecular mass | The mole concept solutions break down atomic masses as per the 2021 periodic table. |
Key Topics: Qualitative analysis, action of NaOH and NH₄OH on salt solutions, colour of precipitates, solubility in excess reagent.
Typical Solutions Include:
Key Topics: Gay-Lussac’s law, Avogadro’s law, mole, vapour density, relative atomic mass, percentage composition, empirical & molecular formula.
Typical Solutions Include:
Key Topics: Electrolytes vs non-electrolytes, mechanism of electrolysis, cathode/anode reactions, Faraday’s laws, electroplating, refining of copper. Question (Dalal 2021, Ex 5C, Q12): Calculate the
Typical Solutions Include:
Maintain a notebook of questions from the 2021 textbook that you got wrong. Revise only these the night before the exam.