Which one of the following reactions is NOT a decomposition reaction?
A
CaCO3(s)→CaO(s)+CO2(g)
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B
2H2O(l)→2H2(g)+O2(g)
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C
2AgCl(s)→2Ag(s)+Cl2(g)
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D
H2(g)+Cl2(g)→2HCl(g)
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Solution
The correct option is DH2(g)+Cl2(g)→2HCl(g) In a decomposition reaction, a single reactant breaks down into multiple products.
In H2(g)+Cl2(g)→2HCl(g), two reactants combine to form a single product, thus it is a combination reaction.