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Siarka + potas -> siarczek potasu
S + 2 K -> K₂S
2)
Tlenek azotu (I) -> Tlen + azot
2 N₂O -> O₂ + 2 N₂
3)
chlorek miedzi (II) + cynk -> miedź + chlorek cynku
CuCl₂ + Zn -> Cu + ZnCl₂