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Which of the following is not a redox reaction?
P
(1) \( 2 \mathrm{Na}+\mathrm{Cl}_{2} \rightarrow 2 \mathrm{NaCl} \)
W
(2) \( \mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2} \)
(3) \( \mathrm{AgNO}_{3}+\mathrm{NaCl} \rightarrow \mathrm{AgCl}+\mathrm{NaNO}_{3} \)
(4) \( \mathrm{Zn}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{ZnSO}_{4}+\mathrm{H}_{2} \)
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