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Question

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 D H2(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.

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