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Which is a reversible reaction?
P
(1) \( \mathrm{H}_{2}+\mathrm{I}_{2} \rightarrow 2 \mathrm{HI} \)
W
(2) \( \mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{Ba}(\mathrm{OH})_{2} \longrightarrow \mathrm{BaSO}_{4} \downarrow+2 \mathrm{H}_{2} \mathrm{O} \)
(3) \( \mathrm{NaCl}+\mathrm{AgNO}_{3} \longrightarrow \mathrm{NaNO}_{3}+\mathrm{AgCl} \downarrow \)
(4) \( 2 \mathrm{KClO}_{3} \longrightarrow 2 \mathrm{KCl}+3 \mathrm{O}_{2} \uparrow \)
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