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  4. Enthalpy change is always negative for which one of the following processes?

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Q. Enthalpy change is always negative for which one of the following processes?

KEAMKEAM 2021

Solution:

Combustion reaction will always occur when a substance reacts with oxygen from air to release energy. Since, heat is released for combustion reaction, the enthalpy change of the system, Delta $H$ will be negative always.