For the following two reactions, $\left( {\rm{i}} \right){\rm{C}}{{\rm{H}}_4}\left( {\rm{g}} \right) + 2{{\rm{O}}_2}\left( {\rm{g}} \right) \to {\rm{C}}{{\rm{O}}_2}\left( {\rm{g}} \right) + 2{{\rm{H}}_2}{\rm{O}}$ ∆H=-890.4 kJ $\left( {{\rm{ii}}} \right)2{\rm{HgO}}\left( {\rm{s}} \right) \to 2{\rm{Hg}}\left( {\rm{l}} \right) + {{\rm{O}}_2}\left( {\rm{g}} \right) - 181.6{\rm{kJ}}$ Which one of the following statements is correct?

(i) is endothermic and (ii) is exothermic

NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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For the following two reactions,

\left( \mathrm{i} \right)\mathrm{C}{\mathrm{H}_4}\left( \mathrm{g} \right) + 2{\mathrm{O}_2}\left( \mathrm{g} \right) \to \mathrm{C}{\mathrm{O}_2}\left( \mathrm{g} \right) + 2{\mathrm{H}_2}\mathrm{O}

∆H=-890.4 kJ

\left( {\mathrm{ii}} \right)2\mathrm{HgO}\left( \mathrm{s} \right) \to 2\mathrm{Hg}\left( \mathrm{l} \right) + {\mathrm{O}_2}\left( \mathrm{g} \right) - 181.6\mathrm{kJ}

Which one of the following statements is correct?

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Correct option: C

(i) is exothermic and (ii) is endothermic

The correct answer is C ((i) is exothermic and (ii) is endothermic) because reaction (i) has a negative ∆H (exothermic), while reaction (ii) has a positive ∆H (endothermic).

NEET UG CHEMISTRY MCQ: THERMODYNAMICS

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