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Class 10 Science – Chapter 1 Important Questions & Answers | CBSE 2025 | Ankit Study Point

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Class 10 Science - Chapter 1: Chemical Reactions and Equations (Most Important Questions with Answers) – CBSE Board Are you preparing for your Class 10 Science Board Exams? Don’t miss out on this specially designed set of the **Top 50 Most Important Questions** from Chapter 1 – “Chemical Reactions and Equations.” This PDF includes: 50 Important Questions (Divided into Sets of 10 for easy revision) Detailed, accurate and simple answers Based on latest CBSE exam pattern Best for quick revisions and last-minute preparation Student-friendly language – Easy to understand Handpicked by subject expert Why this PDF? These questions cover all the key concepts like types of chemical reactions, oxidation, reduction, displacement, decomposition, redox, corrosion, and real-life applications. Bonus: Perfect for self-study, school exams, and scoring 90+ in CBSE Boards! Notes by: *Ankit Study Point* Format: Clean, neat & organized (ideal for print or screen study) Download now and take your preparation one level higher!

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Q31. What is the chemical formula of quick lime?

Ans: CaO (Calcium oxide)



Q32. What is bleaching powder? Give its formula.

Ans: Bleaching powder is Ca(OCl)2, used for disinfecting and bleaching.



Q33. Why is double displacement reaction also called precipitation reaction?

Ans: Because it often forms an insoluble product called precipitate.



Q34. Give an example of a double displacement reaction.

Ans: Na2SO4 + BaCl2 → BaSO4 (↓) + 2NaCl



Q35. What is the color of ferrous sulphate?

Ans: Green



Q36. What is observed when iron nail is dipped in copper sulphate?

Ans: The solution turns green and a brown coating of copper forms on iron.



Q37. Define combination reaction.

Ans: A reaction where two or more reactants combine to form one product.



Q38. Which gas is evolved during reaction of baking soda with vinegar?

Ans: Carbon dioxide (CO2)



Q39. What type of reaction is used in fire extinguishers?

Ans: Acid-base neutralization reaction

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