Chemistry - Thermodynamics - II Question with Solution | TestHub

Explain Question: Match process with given parameters

Concept: Different process having different thermodynamic parameters.

Solution:

(A) matches (p,q,r): Boiling an egg denatures proteins, increasing disorder ( $\Delta \mathrm{S}=+\mathrm{ve}$ ). It requires heat $(\Delta \mathrm{H}=+\mathrm{ve})$ and is spontaneous $(\Delta \mathrm{G}=-\mathrm{ve})$.

(B) matches (p,q,r): Thermal decomposition is endothermic ( $\Delta \mathrm{H}=+\mathrm{ve}$ ). Formation of ${\mathrm{CO}}_2$ gas increases disorder $(\Delta \mathrm{S}=+\mathrm{ve})$. It's spontaneous at high temperatures $(\Delta \mathrm{G}=-\mathrm{ve})$.

(C) matches (p,r,s,t): White and red phosphorus are allotropes, making it an allotropic change (s). Red P is more stable $(\Delta \mathrm{G}=-\mathrm{ve})$ and more ordered $(\Delta \mathrm{S}=-\mathrm{ve})$ than white P and heating is required.

(D) matches (r,t): Gas adsorption is a spontaneous process $(\Delta \mathrm{G}=-\mathrm{ve})$. As gas molecules are fixed on a solid surface, they lose randomness, so entropy decreases $(\Delta \mathrm{S}=-\mathrm{ve})$.

Final Answer: Option (C)