Chemical reactions and equations, Cless 10 Science (NCERT Textbook)

1. What is combination reaction? Give an example with a chemical equation.
Sol. A reaction in which a single product is formed from two or more reactants is known as combination reaction.
     As for example, calcium oxide reacts vigorously with water to produce slaked lime releasing a large amount of heat.
     Cao
2. What are exothermic chemical reactions? Give an example with an equation.
Sol. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions.
    As for example, burning of natural gas is an exothermic reaction.
CH4 (g) + 2O2 (g) ....
3. What is decomposition reaction? Give an example with equation.
Sol. A reactioin in which a single reactant breaks down to give similar products is known as a decomposition reaction.
      E.g. Decomposition of calcium carbonate to calcium oxide and carbon.
.......
5. What is combination reaction? Give an example with an equation.
Sol. Displacement reaction is A chemical reaction in which a more reactive element displaces a less reactive element from its compound is called a displacement reaction.

Example : Reaction of iron nails with copper sulphate solution.
   Fe (s) +....