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Solution
Year: 2024
Topic: Chemical Thermodynamics
2. In which of the following processes entropy form increases ?
(1).A liquid evaporates to vapour
(2). Temperature of a crystalline solid lowered from 130 K to 0 K
(3). \(2\text{NaHCO}_3\left(g\right)\,\rightarrow\,\text{Na}_2\text{CO}_3\left(s\right)\,+\,\text{CO}_2\left(g\right)\,+\,\text{H}_2\text{O}\left(g\right)\)
(4). \( \text{Cl}_2(g) \rightarrow 2\text{Cl}(g) \)
Solution
Year: 2024
Topic: Chemical Thermodynamics
3. The work done during reversible isothermal expansion of one mole of hydrogen gas at \(25^\circ \text{C}\) from pressure of \(20\) atmosphere to \(10\) atmosphere is:
(Given \(\text{R}\,=\,2.0\,cal K^{-1}mol^{-1}\))
(Given \(\text{R}\,=\,2.0\,cal K^{-1}mol^{-1}\))
(1).413.14 calories
(2). 100 calories
(3). 0 calorie
(4). -413.14 calories
Solution
Year: 2025
Topic: Chemical Thermodynamics
4. The standard heat of formation, in kcal/mol of \(Ba^{2+}\) is:
[Given : standard heat of formation of \(\text{So}^{2-}_4 ion (aq) = - 216 kcal/mol, standard heat of crystallisation of \(\text{BaSO}_4(s) = - 4.5 kcal/mol, standard heat of formation of \(\text{ BaSO}_4(s) = - 349 kcal/mol]
(1).+ 220.5
(2). - 128.5
(3). - 133.0
(4). + 133.0




