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Question

Complete and balance the following equation :

KNO3_____+______


A

KNO2(s)

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B

O2(g)

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Solution

  • When potassium nitrate is heated, it decomposes into Potassium nitrite and Oxygen. This is an example of a decomposition reaction.
  • A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

KNO3(s)KNO2(s)+O2(g)

Balancing-

  • Multiply KNO3 by 2 to get 6 oxygen atoms on the reactant side.
  • Multiply KNO2 by 2 to balance the Potassium atom on the product side.
  • We get 6 Oxygen atoms on both sides.

Hence, the complete balanced equation is-

2KNO3(s)Potassiumnitrate2KNO2(s)Potassiumnitrite+O2(g)Oxygen


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