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NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations
NCERT Solutions for Class 10 Science Chapter 1 NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations NCERT Questions Question 1: Why should magnesium ribbon be cleaned before burning in air? Answer: Magnesium is a reactive metal. When it is exposed to atmosphere for longer time, the oxygen present in the atmosphere combines and MgO is formed on the metal surface. This oxide layer does not burn in the flame so magnesium ribbon has to be cleaned with sandpaper before burning in air. Question 2: Write the balanced equations for the following chemical reactions: (a) Hydrogen + Chlorine ➝ Hydrogen chloride (b) Barium chloride + Aluminium sulphate ➝ Barium sulphate + Aluminium chloride (c) Sodium + Water ➝ Sodium hydroxide + Hydrogen. Answer: The balanced equations are written as: (a) H2 + Cl2 ➝ 2HCl (b) 3BaCl2 + Al2(SO4)3 ➝ 3BaSO4 + 2AlCl3 (c) 2Na + 2H2O ➝ 2NaOH + H2. Question 3: Write the balanced equations with state symbols for the following reactions: (a) Solutions o…