In which of the following reactions, there is no change in valency ?
(a) \( 4 \mathrm{KClO}_{3} ...
In which of the following reactions, there is no change in valency ?
(a) \( 4 \mathrm{KClO}_{3} \longrightarrow 3 \mathrm{KClO}_{4}+\mathrm{KCl} \)
(b) \( \mathrm{SO}_{2}+2 \mathrm{H}_{2} \mathrm{~S} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}+3 \mathrm{~S} \)
(c) \( \mathrm{BaO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{BaSO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2} \)
(d) \( 3 \mathrm{BaO}+\mathrm{O}_{2} \longrightarrow 2 \mathrm{BaO}_{2} \).
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