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Chapter 1|| Chemical reaction and Equation || Class 12 || NCERT Exemplar Solution

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                                                     Chapter - 1 Chemical Reactions and Equations Multiple Choice Questions  1. Which of the following is not a physical change?  (a) Boiling of water to give water vapour  (b) Melting of ice to give water  (c) Dissolution of salt in water  (d) Combustion of Liquefied Petroleum Gas (LPG)  Soln: Answer is (d) Combustion of Liquefied Petroleum Gas (LPG)  Explanation: Combustion is always a chemical change because new compound is formed after burning and it is irreversible. 2. The following reaction is an example of a 4NH3 (g) + 5O2 (g) → 4NO(g) + 6H2O(g)  (i) displacement reaction  (ii) combination reaction  (iii) redox reaction  (iv) neutralisation reaction  (a) (i) and (iv)  (b) (ii) and (iii)  (c) (i) and (iii)  (d) (iii) and (iv)...

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