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Question

Combustion reaction is usually .................. whereas decomposition reaction is ................ usually.

A
endothermic, exothermic
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B
exothermic, endothermic
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C
endothermic, conduction
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D
none of above
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Solution

The correct option is D exothermic, endothermic
Exothermic reactions release heat and light into their surroundings. For example, combustion reactions are usually exothermic. Endothermic reactions, on the other hand, absorb heat and/or light from their surroundings. For example, decomposition reactions are usually endothermic.

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