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  ATOMS AND MOLECULES CLASS 9TH                                 SCIENCE                                      QUESTIONS                                                 CLICK DOWNLOAD                                                       DOWNLOAD

  Chemical Reactions and Equations Class 10  Important Questions Science Chapter 1 1.  Which of the following is a displacement reaction? Answer: b Explaination: Reason: Here sodium (Na) displaces to form sodium hydroxide. 2. Name the products formed when iron filings are heated with dilute hydrochloric acid (a) Fe (III) chloride and water (b) Fe (II) chloride and water (c) Fe (II) chloride and hydrogen gas (d) Fe (III) chloride and hydrogen gas Answer: d Explaination: Reason: 2Fe + 6HCl → 2FeCl 3  (Iron (III) chloride) + 3H 2 Question-3 What is the method of balancing chemical equation? Solution: Hit and trial method is used for balancing simple chemical equations. In this method, coefficients before the symbols/formulae of the reactants and products are adjusted in such a way that the total number of atoms of each element on both the sides becomes equal. Question-4 What are the different ways can make more informative about the chemical equation? Solution: 1. By in...