Introduction: This set covers
fundamental concepts of chemical reactions including combination,
decomposition, displacement, and double displacement reactions. Questions focus
on balancing equations, identifying reaction types, and understanding
oxidation-reduction processes essential for NCERT, JKBOSE, and CBSE Class 10
students.
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📘 SCIENCE
CHEMISTRY | Chemical Reactions and Equations-A
📝 Questions: 50
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Q1. What happens when ferrous sulphate crystals are heated strongly?
Q2. What type of reaction is shown by: 2FeSO₄(s) + Heat → Fe₂O₃(s) + SO₂(g) + SO₃(g)?
Q3. What is the characteristic odour observed when heating ferrous sulphate crystals?
Q4. What are the gaseous products of the thermal decomposition of ferrous sulphate?
Q5. What is the solid product formed when calcium carbonate is heated strongly?
Q6. Which substance is produced by the thermal decomposition of limestone in the cement industry?
Q7. What type of decomposition reaction is carried out by heating?
Q8. What are the brown fumes observed when lead nitrate is heated?
Q9. In the decomposition of lead nitrate, what is the other gas produced along with nitrogen dioxide?
Q10. What is the process of decomposing water into hydrogen and oxygen by passing electricity called?
Q11. What is added to water to make it conduct electricity during its electrolysis?
Q12. What are the two gases produced during the electrolysis of water?
Q13. In a double displacement reaction between sodium sulphate and barium chloride, what is observed?
Q14. What is the chemical name of the white precipitate formed in the reaction: Na₂SO₄ + BaCl₂ → ?
Q15. What type of reaction is Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + 2NaCl(aq)?
Q16. In a double displacement reaction, what happens between the reactants?
Q17. What is another name for a reaction that produces an insoluble solid?
Q18. In the double displacement reaction between lead nitrate and potassium iodide, what is the colour of the precipitate?
Q19. What remains dissolved in the solution after the reaction between sodium sulphate and barium chloride?
Q20. Which ions combine to form the precipitate in the reaction between sodium sulphate and barium chloride?
Q21. What is the physical state of barium sulphate (BaSO₄) in the chemical equation?
Q22. In the reaction between sodium sulphate and barium chloride, which substance is responsible for the formation of the white precipitate?
Q23. The decomposition of water into hydrogen and oxygen by electricity is an example of what?
Q24. Which industry uses the thermal decomposition of calcium carbonate?
Q25. What is the chemical formula of the compound that loses water to become anhydrous before decomposing?
Q26. What is the purpose of adding dilute sulphuric acid to water in the electrolysis activity?
Q27. In the decomposition of lead nitrate, what is the solid product?
Q28. What is the key visual change indicating a decomposition reaction has occurred when heating ferrous sulphate?
Q29. In a precipitation reaction, the insoluble solid formed is called what?
Q30. What must be carefully handled by the teacher in the electrolysis of water activity?
Q31. What is the ratio of gases produced during the electrolysis of water?
Q32. What is the chemical name of the compound precipitated in the reaction between lead nitrate and potassium iodide?
Q33. Which of the following is NOT a product of heating lead nitrate?
Q34. What is the state symbol for sulphur dioxide in the decomposition of ferrous sulphate?
Q35. What is the primary reason for calling the reaction between sodium sulphate and barium chloride a double displacement?
Q36. What happens to the colour of lead nitrate crystals upon heating?
Q37. In the context of decomposition reactions, what does the term "thermal" refer to?
Q38. What is the common feature between the decomposition of ferrous sulphate, calcium carbonate, and lead nitrate?
Q39. What is the valency of the sulphate ion (SO₄²⁻)?
Q40. What gas is tested by bringing a burning candle close and produces a pop sound?
Q41. What is the common name of calcium oxide (CaO)?
Q42. Quick lime (CaO) is produced by the thermal decomposition of which substance?
Q43. In the ionic exchange of Na₂SO₄ and BaCl₂, which ion from BaCl₂ combines with SO₄²⁻?
Q44. What is the colour of ferrous sulphate crystals before heating?
Q45. What does the arrow with "Heat" written above it in a chemical equation indicate?
Q46. What is the main industrial use of the decomposition reaction of calcium carbonate?
Q47. What is the specific term for the decomposition reaction carried out using electricity, as shown with water?
Q48. What is the other name for a double displacement reaction that produces a precipitate?
Q49. In the decomposition of ferrous sulphate, what is the fate of the water molecules in the crystal?
Q50. Which statement correctly describes a decomposition reaction?
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