JEE Main 2025 (Online) 28th January Morning Shift | Thermodynamics Question 5 | Chemistry

Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15 K . If pressure of the system is increased 2 times, keeping temperature constant, then identify correct observation from following

Liquid phase disappears completely.

The amount of ice decreases.

The solid phase (ice) disappears completely.

Volume of system increases .

JEE Main 2025 (Online) 24th January Evening Shift

MCQ (Single Correct Answer)

-1

$$\begin{aligned} & \mathrm{S}(\mathrm{~g})+\frac{3}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{SO}_3(\mathrm{~g})+2 x \mathrm{kcal} \\ & \mathrm{SO}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{SO}_3(\mathrm{~g})+y \mathrm{kcal} \end{aligned}$$

The heat of formation of $\mathrm{SO}_2(\mathrm{~g})$ is given by :

$2 x+y$ kcal

$\frac{2 x}{y} \mathrm{~kcal}$

$y-2 x \mathrm{~kcal}$

$x+y \mathrm{~kcal}$

JEE Main 2025 (Online) 24th January Evening Shift

MCQ (Single Correct Answer)

-1

Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature?

50 mL HCl and 20 mL NaOH

30 mL HCl and 30 mL NaOH

$45 \mathrm{~mL} \mathrm{~CH}_3 \mathrm{COOH}$ and 25 mL NaOH

$30 \mathrm{~mL} \mathrm{~CH}_3 \mathrm{COOH}$ and 30 mL NaOH

JEE Main 2025 (Online) 24th January Morning Shift

MCQ (Single Correct Answer)

-1

Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the reaction is spontaneous at boiling point of water. Choose the correct option.

Both $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ are (-ve)

$\Delta \mathrm{H}$ is $(+\mathrm{ve})$ but $\Delta \mathrm{S}$ is (-ve)

$\Delta \mathrm{H}$ is $(-\mathrm{ve})$ but $\Delta \mathrm{S}$ is (+ve)

Both $\Delta \mathrm{H}$ and $\Delta \mathrm{S}$ are (+ve)

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