Essential Chemistry for IGCSE - Chemical Reactions (Section 2 - No. 19)
If the forward reaction in a reversible reaction is exothermic, what is true about the reverse reaction?
It is also exothermic.
It is endothermic.
It is neither exothermic nor endothermic.
Its enthalpy change is zero.
Explanation
If the forward reaction is exothermic, the reverse reaction must be endothermic.
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