In which of the following reactions no change in
valency occurs?....
In which of the following reactions no change in
\( \mathrm{P} \)
valency occurs?
(1) \( \mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{~S} \rightarrow 3 \mathrm{~S}+2 \mathrm{H}_{2} \mathrm{O} \)
(2) \( 2 \mathrm{Na}+\mathrm{O}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{O}_{2} \)
(3) \( \mathrm{Cl}_{2}+2 \mathrm{NaOH} \rightarrow \mathrm{NaClO}+\mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O} \)
(4) \( \mathrm{AgNO}_{3}+\mathrm{KCl} \rightarrow \mathrm{AgCl}+\mathrm{KNO}_{3} \)
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