Question

1 . What do you mean by precipitation reaction? Explain by giving examples.
2. Write one equation each for decomposition reaction where energy is supplied in the form of heat, light or electricity .


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Answer 1

1. Precipitation reaction are the formation of an insoluble salt when two solutions containing soluble salts that are combined example of precipitation reactions is the chemical reaction between potassium chloride and silver nitrate, in which solid silver chloride is precipitated out.

2. A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

CaCO3 (Heat) ⟶ CaO + CO2 : Heat

2H2O2⟶ 2H2O + O2 : light

2H2O(l) ⟶ 2H2(g) + O2(g) : Electricity.

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