CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 25 of 60

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

$2 {\H}_2 {\O}( {\l}) → 2 {\H}_2( {\g})+ {\O}_2( {\g})$
$2 {\AgBr}( {\ s}) → 2 {\Ag}( {\ s})+ {\Br}_2$ (g)
$2 {\AgCl}$ (s) $→ 2 {\Ag}( {\ s})+ {\Cl}_2$ (g)
${\CaCO}_3$ (s) $→ {\CaO}$ (s) $→ {\CO}_2$ (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.

{\CaCO}_3 → {\CaO}+ {\CO}_2

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