NCERT Solutions - Chapter 1 - Chemical Reactions and Equations - Class 10 - Science
All Chapter 1 – Chemical Reactions and Equations Exercise Questions with Solutions to help you to revise complete Syllabus and Score More marks. Page Number: 6 Question 1 Why should a magnesium ribbon be cleaned before burning in air ? Answer: Magnesium gets covered with a layer of magnesium oxide when kept in air for a long time. This layer hinders the burning of magnesium. Hence, it is to be cleaned before burning. Question 2 Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminum sulphate → Barium sulphate + Aluminum chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen Answer: (i) H 2 + Cl 2 → 2HCl (ii) 3 BaCl 2 + Al 2 (SO 4 ) 3 → BaSO 4 + 2 AlCl 3 (iii) 2Na + 2H 2 O → 2NaOH + H 2 ↑ Question 3 Write a balanced chemical equation with state symbols for the following reactions : (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the so