CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 25

Total: 60

Which one of the following reactions is categorised as thermal decomposition reaction?

2H2O(l)→2H2(g)+O2(g)
2‌AgBr( s)→2‌Ag( s)+Br2 (g)
2‌AgCl (s) →2‌Ag( s)+Cl2 (g)
CaCO3 (s) →CaO (s) →CO2 (g)

Solution:

When a decomposition reaction is carried out by heating, it is called 'thermal decomposition'.
The decomposition reaction of calcium carbonate into calcium oxide and carbondioxide is an example of thermal decomposition.
CaCO3→CaO+CO2

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