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Which of the following reaction involves
P oxidation and reduction?

W
(1) \( \mathrm{NaBr}+\mathrm{HCl} \longrightarrow \mathrm{NaCl}+\mathrm{HBr} \)
(2) \( \mathrm{HBr}+\mathrm{AgNO}_{3} \rightarrow \mathrm{AgBr}+\mathrm{HNO}_{3} \)
(3) \( \mathrm{H}_{2}+\mathrm{Br}_{2} \longrightarrow 2 \mathrm{HBr} \)
(4) \( \mathrm{Na}_{2} \mathrm{O}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O} \)
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