Thermodynamics (C)

Which of the following show an increase in entropy? I. Boiling of water II. Melting of ice III. Freezing of water IV. Formation of hydrogen gas from water

Which of the following reactions does not involveabsorption of energy? I. $O\left(g\right)+e^{-}\longrightarrow\,O^{-}\left(g\right)$ II. $S\left(g\right)+e^{-}\longrightarrow\,S^{-}\left(g\right)$ III.…

The bond dissociation energy of $X_2, Y_2$ and $X Y$ are in the ratio of $1: 0.5: 1 . \Delta H$ for the formation of $X Y$ is $-200 \mathrm{~kJ} / \mathrm{mol}$. The bond dissociation energy of $X_2$ will be

The standard Gibbs energy $\left(\Delta G^0\right)$ for the following reaction is $\begin{aligned} & \mathrm{A}(\mathrm{s})+\mathrm{B}^{2+}(\mathrm{aq}) \rightarrow \mathrm{A}^{2+}(\mathrm{aq})+\mathrm{B}(\mathrm{s}),…

Which of the following relation is not correct?

The combustion of benzene (L) gives $\mathrm{CO}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(L)$. Given that heat of combustion of benzene at constant volume is $-3263.9 \mathrm{~kJ} \mathrm{~mol}^{-}$ ${ }^1$ at…

Given that bond energies of $\mathrm{H}-\mathrm{H}$ and $\mathrm{Cl}-\mathrm{Cl}$ are $430 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $240 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively and $\Delta \mathrm{H}_{\mathrm{f}}$ for…

If enthalpies of formation of $\mathrm{C}_2 \mathrm{H}_4(\mathrm{~g}), \mathrm{CO}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(\mathrm{l})$ at $25^{\circ} \mathrm{C}$ and $1 \mathrm{~atm}$ pressure are 52,394 and $-286…

In an adiabatic process, no transfer of heat takes place between system and surrounding. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.

Standard entropy of $X_2, Y_2$ and $X Y_2$ are 60,40 and $50 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$, respectively. For the reaction, $\frac{1}{2} X_2+\frac{3}{2} Y_2 \longrightarrow X Y_3, \Delta H=-30 \mathrm{~kJ}$, to…

Work out the heat change (cal) when $40 \mathrm{~g}$ of He gas at $27^{\circ} \mathrm{C}$ undergoes isothermal and reversible compression from initial pressure of $1 \mathrm{~atm}$ to $10 \mathrm{~atm}\left(\mathrm{R}=2…

For the combustion reaction at $298 \mathrm{~K}$ $2 \mathrm{Ag}(\mathrm{s})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{Ag}_{2} \mathrm{O}(\mathrm{s})$ Which of the following alternatives is correct?