Решите цепочки хим.реакций)))
1)Fe ⇒ FeCl3 ⇒ Fe(OH)3 ⇒ Fe2(SO4)3 ⇒ FeCl3
2)CuS ⇒ SO2 ⇒ SO3 ⇒ H2SO4 ⇒ H2 ⇒ HCl ⇒ FeCl2
3)KCl3 ⇒ KCl ⇒ KNO3
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