Chemical Thermodynamics — Advanced + PYQ (Hard Difficulty)

Practice 100 questions on Chemical Thermodynamics — Advanced + PYQ (Hard Difficulty). Includes: **Assertion (A):** $\Delta G = 0$ at equilibrium.…; **Assertion (A):** Entropy of the universe always…; **Assertion (A):** In free expansion of an ideal gas…. Free quiz on NoteTube.

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1.
**Assertion (A):** For the reaction $2SO_{2}$(g) + $O_{2}$(g) → $2SO_{3}$(g), $|\Delta H| > |\Delta U|$ (when both are negative). **Reason (R):** $\Delta n_g < 0$, so $\Delta H = \Delta U + \Delta n_g RT$ gives $\Delta H < \Delta U$ (more negative).
2.
Calculate $\Delta H$ for the reaction: $H_{2}$(g) + $Br_{2}$(g) → 2HBr(g). Bond enthalpies: $BE(H-H) = 436$, $BE(Br-Br) = 193$, $BE(H-Br) = 366$ kJ/mol.
3.
$\Delta H_f^\circ$ of $SO_{3}$(g) is $-396$ kJ/mol and of $SO_{2}$(g) is $-297$ kJ/mol. Calculate $\Delta H^\circ$ for: $2SO_{2}$(g) + $O_{2}$(g) → $2SO_{3}$(g).
4.
For the reaction $PCl_{5}$(g) ⇌ $PCl_{3}$(g) + $Cl_{2}$(g), which of the following increases the equilibrium constant $K$?
5.
**Assertion (A):** For the dissolution of $NH_{4}Cl$ in water, $\Delta G < 0$ at room temperature. **Reason (R):** $\Delta H > 0$ (endothermic) means $\Delta G$ must also be positive.

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