S+Na---> S+Fe---> S+Hg---> S+H2---> S+F2---> S+KCIO--->

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вопрос

This is a series of single displacement reactions where a more reactive element replaces a less reactive element in a compound.

S + Na → No reaction, as sulfur is less reactive than sodiumS + Fe → FeSS + Hg → No reaction, as sulfur is less reactive than mercuryS + H2 → H2SS + F2 → SF6S + KClO → No reaction, as sulfur is less reactive than chlorine, and potassium chlorate is not a suitable reactant.

Each reaction involves the displacement of sulfur to form a different compound with the more reactive element.