Chemical Reactions and Equations — Question 14
Back to all questionsQuestion 14
In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved?
Cu (s) + 2AgNO3 (aq) ⟶ Cu(NO3)2 (aq) + 2Ag (s)
Key Concepts Covered
This question tests your understanding of the following concepts from the chapter Chemical Reactions and Equations: Question, Refining, Silver, Recovery, Nitrate, Solution. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 10 curriculum.
A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This Question
Read the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to Remember
- Read the question carefully and identify all parts before answering.
- Use the terminology specific to this subject and chapter.
- Review the textbook content for this chapter before attempting questions.
- Practice writing concise, well-structured answers within time limits.
Practice more questions from Chemical Reactions and Equations — Science, Class 10 CBSE
Chapter 1: Chemical Reactions and Equations — Quick Revision Guide
Introduction
Chemical reactions are processes where substances interact to form new substances with different properties. This chapter covers the writing and balancing of chemical equations, types of chemical reactions, and the real-world effects of oxidation.
Key Points at a Glance
- A chemical equation represents a reaction using symbols and formulae with state symbols (s), (l), (g), (aq)
- Equations must be balanced — same number of atoms of each element on both sides (Law of Conservation of Mass)
- Combination: Two or more substances combine into one product. Example: CaO + H2O → Ca(OH)2
- Decomposition: One substance breaks into two or more. Types: thermal, electrolytic, photolytic. Example: 2FeSO4 → Fe2O3 + SO2 + SO3
- Displacement: More reactive element displaces less reactive from its compound. Example: Fe + CuSO4 → FeSO4 + Cu
- Double displacement: Exchange of ions between two compounds. Example: Na2SO4 + BaCl2 → BaSO4↓ + 2NaCl
- Redox: Simultaneous oxidation (gain of O / loss of H) and reduction (loss of O / gain of H). Example: CuO + H2 → Cu + H2O
- Corrosion: Slow destruction of metals by environment — rusting of iron (Fe2O3·xH2O); prevention: painting, oiling, galvanising, alloying
- Rancidity: Oxidation of fats/oils giving bad taste/smell; prevention: antioxidants, airtight containers, refrigeration, nitrogen flushing
Real-World Connections
Respiration is oxidation of glucose; digestion involves decomposition; formation of curd from milk is a chemical change; fireworks involve combination reactions; electroplating is a redox process.
Quick Self-Test (5 Questions)
- What is the most important concept you learned from this chapter?
- Can you write three key equations/formulae from this chapter from memory?
- Draw a labelled diagram relevant to this chapter without looking at your notes.
- Explain one real-world application of a concept from this chapter.
- What is one common mistake students make in this chapter, and how can you avoid it?
Further Study
- NCERT Textbook Chapter 1
- NCERT Exemplar Problems
- Bright Tutorials Detailed Notes: ch01-chemical-reactions.html
- Bright Tutorials Practice Questions: ch01-chemical-reactions.html
- Previous Year CBSE Board Papers