Which of the following is not a redox change?....

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Which of the following is not a redox change?
\( \mathrm{P} \)
(1) \( 2 \mathrm{H}_{2} \mathrm{~S}+\mathrm{SO}_{2} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{~S} \)
W
(2) \( 2 \mathrm{BaO}+\mathrm{O}_{2} \rightarrow 2 \mathrm{BaO}_{2} \)
(3) \( \mathrm{BaO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{BaSO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2} \)
(4) \( 2 \mathrm{KClO}_{3} \rightarrow 2 \mathrm{KCl}+3 \mathrm{O}_{2} \)


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