Реакцией замещения является реакция, схема которой:
1) KClO3 → KCl + O2↑ 3) H2 + S → H2S↑ 2) H2SO4 + Zn(OH)2 → H2O +ZnSO4 4) H2SO4 + Zn → H2↑ + ZnSO4.
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