Decomposition reaction

CBSE - 10 Chemical Reactions and Equations

Types of Chemical ReactionsChemistry

When a single compound breaks up into two or many simpler substances it is called decomposition reaction.

Decomposition

Breaking of single compound into simpler substances

Decomposition Reaction

Subtopic ID: 01.03.02



When we heat lead nitrate it becomes lead oxide with the evolution of oxygen gas and brown fumes of nitrogen dioxide.

2Pb(NO3)2 2PbO + 4NO2↑ + O2 ↑Heat

Brown fumes of

nitrogen dioxide





Watch this experiment and answer the question.Why does blue copper sulphate

solution become white on heating?

View answer





.

CuSO4.5H2O CuSO4 + 5H2O



Blue copper sulphate pentahydrate undergoes decomposition on heating to give white anhydrous copper sulphate and water vapour



2H2O Electrolysis 2H2 + O2

Decomposition Reaction When we introduce electricity using a 9 volts battery, water separates into hydrogen and oxygen. This reaction is called electrolysis. It is another example of decomposition reaction. You can observe the evolution of hydrogen gas at cathode and oxygen at anode during the electrolysis of water. The evolution of gas increases when we add a few pinches of table salt.


Electrolysis



2AgCl Sunlight 2Ag + Cl2

Decomposition Reaction Silver chloride is sensitive to light. On exposure to sunlight it becomes silver. Since this reaction takes place in presence of sunlight it is also called photochemical reaction.


Photochemical Reaction

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Decomposition reaction