AP EAMCET · Chemistry · Thermodynamics (C)

For the reaction $H_{2} O_{(l)} ⟶ H_{2} O_{(g)}$ at $T = 100 ° C$ and $P = 1 atm$ , choose the correct option:

A ${ΔS}_{system} > 0 & {ΔS}_{surroundings} > 0$
B ${ΔS}_{system} > 0 & {ΔS}_{surroundings} < 0$
C ${ΔS}_{system} < 0 & {ΔS}_{surroundings} > 0$
D ${ΔS}_{system} < 0 & {ΔS}_{surroundings} < 0$

Verified Solution

Answer & Solution

Correct Answer

(B) ${ΔS}_{system} > 0 & {ΔS}_{surroundings} < 0$

Step-by-step Solution

Detailed explanation

The given reaction is: H2Ol →H2Og It is the equilibrium reaction We know that at equilibrium position ∆Suniverse = 0 i Also, the relation between entropies of system and surrounding is…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Match List I with List II

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(A)	Frenkel defects	(1)	$FeO$
(B)	Schottkey defects	(2)	$NaCl$
(C)	Vacancy defects	(3)	$AgCl$
(D)	Metal deficiency defects	(4)	Crystals with vacant lattice sites.

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For the reaction H2O(l)⟶H2O(g) at T=100°C and P=1 atm, choose the correct option:

Step-by-step Solution

For the reaction $H_{2} O_{(l)} ⟶ H_{2} O_{(g)}$ at $T = 100 ° C$ and $P = 1 atm$ , choose the correct option: