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7 May, 20:32

What is always true of a combustion reaction? oxygen gas must be one of the reactants carbon monoxide will be produced the reaction absorbs energy one reactant must contain chlorine

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  1. 7 May, 20:47
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    The correct answer should be

    carbon monoxide will be produced

    Combustions release heat, they don't absorb it. Oxygen is not necessary as other gasses can also do it, while chlorine is not necessary.
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