The temperature of the system decreases in an:

In figure, $A$ and $B$ are two adiabatic curves for two different gases. Then, $A$ and $B$ correspond to,

Consider the cyclic process$\mathrm{R}\to$$\mathrm{S}\to \mathrm{R}$ as shown in the Fig. You are toid that one of the path is adiabatic and the other one isothermal. Which one of the following is(are) true?

Predict which of the following reaction $\left(\mathrm{s}\right)$ has a positive entropy change?

$\mathrm{I}. {\mathrm{Ag}}^{+}\left(\mathrm{aq}\right)+{\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)⟶\mathrm{AgCl}\left(\mathrm{s}\right)$

$\mathrm{II}. {\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right)⟶{\mathrm{NH}}_3\left(\mathrm{g}\right)+\mathrm{HCl}\left(\mathrm{g}\right)$

$\mathrm{III}. 2{\mathrm{NH}}_3\left(\mathrm{g}\right)⟶{\mathrm{N}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right)$

Which of the following reactions is associated with the most negative change in entropy?