A piece of \( \mathrm{NH}_{4} \mathrm{Cl} \) is kept inside a ballon filled with some air, havin...

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A piece of \( \mathrm{NH}_{4} \mathrm{Cl} \) is kept inside a ballon filled with some air, having thermally insulated walls. The temperature is kept just above sublimation temperature of \( \mathrm{NH}_{4} \mathrm{Cl} \).
\[
\mathrm{NH}_{4} \mathrm{Cl}(\mathrm{s}) \stackrel{\text { sublime }}{\longrightarrow} \mathrm{NH}_{3}(\mathrm{~g})+\mathrm{HCl}(\mathrm{g}) \text {. }
\]
Which of the following is correct regarding this?
Temperature just above sublimation temperature of \( \mathrm{NH}_{4} \mathrm{Cl} \)
(a) \( \mathrm{q}_{\text {system }}= \) positive
(b) \( \Delta \mathrm{U}= \) negative
(c) \( \mathrm{w}= \) zero
(d) \( \Delta \mathrm{U}= \) positive
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