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NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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A positive change in enthalpy occurs in :
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Correct option: C
MgCO3(s)→MgO(s)+CO2(g)\mathrm{MgC}{\mathrm{O}_3}\left( s \right) \to \mathrm{MgO}\left( s \right) + \mathrm{C}{\mathrm{O}_2}\left( \mathrm{g} \right)
Option C (MgCO3(s)→MgO(s)+CO2(g)\mathrm{MgC}{\mathrm{O}_3}\left( s \right) \to \mathrm{MgO}\left( s \right) + \mathrm{C}{\mathrm{O}_2}\left( \mathrm{g} \right)) is correct because the decomposition of MgCO3 is an endothermic process, requiring energy input and resulting in a positive enthalpy change.

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