কোনটি উভমুখী বিক্রিয়ার উদাহরণ নয়?

$\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}(\mathrm{s}) \stackrel{\Delta}{\rightleftharpoons} \mathrm{CuSO}_{4}(\mathrm{~s})+5 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})$

$\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}(\mathrm{l})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \stackrel{\Delta}{\rightleftharpoons} \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(\mathrm{l})+\mathrm{CH}_{3} \mathrm{COOH}(\mathrm{l})$

$\mathrm{NH}_{4} \mathrm{Cl}(\mathrm{s}) \rightleftharpoons \mathrm{NH}_{3}(\mathrm{~g})+\mathrm{HCl}(\mathrm{g})$

$2 \mathrm{KClO}_{3}(\mathrm{~s}) \stackrel{\Delta}{\rightleftharpoons} 2 \mathrm{KCl}(\mathrm{s})+30_{2}(\mathrm{~g})$