Question

Define the term decomposition reaction.Give one example each of thermal decomposition and electrolytic decomposition.
(class 10 CBSE SAMPLE PAPER 2017-18 SCIENCE)

Answer 1

In decomposition reaction a compound splits up into two or more simpler substances. The reactions are carried out by applying heat, light or electricity.

Thermal decomposition:
When a decomposition reaction is carried out by heating it is called thermal decomposition reaction.

CaCO3 (s) -----heat> CaO(s) + CO2(g)

Electrolytic decomposition:

When a decomposition reaction is carried out with the help of electric current it is called electrolytic decomposition reaction. This process is also called electrolysis.

2H2O(l) -----electric current> 2H2(g) + O2(g)

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Answer 2

Answer:

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