Решите цепочки превращений:1. NiCl2 -> Ni -> NiCl2 -> Ni(OH)2 -> NiO -> NiSO4 ->...

1. $NiCl_2 + 2Na = 2NaCl + Ni$
$Ni + 2HCl = NiCl_2 + H_2$
$NiCl_2 + 2KOH = 2KCl + Ni(OH)_2$
$Ni(OH)_2 =^t NiO + H_2O$
$NiO + H_2SO_4 = NiSO_4 + H_2O$
$NiSO_4 + Mg(OH)_2 = Ni(OH)_2 + MgSO_4$
2. $MgO + H_2 = Mg + H_2O$
$Mg + 2HCl = MgCl_2 + H_2$
$MgCl_2 + Pb(OH)_2 = Mg(OH)_2 + PbCl_2$
$Mg(OH)_2 =^t MgO + H_2O$
$MgO + H_2SO_4 = MgSO_4 + H_2O$
$MgSO_4 + Ba(OH)_2 = BaSO_4 + Mg(OH)_2$
3. $4Cr + 3O_2 = 2Cr_2O_3$
$Cr_2O_3 + 6HCl = 2CrCl_3 + 3H_2O$
$CrCl_3 + 3KOH = Cr(OH)_3 + 3KCl$
$-$
$2Cr + 6HCl = 2CrCl_3 + 3H_2$
4. $ZnSO_4 + 2KOH = Zn(OH)_2 + K_2SO_4$
$Zn(OH)_2 =^t ZnO + H_2O$
$ZnO + H_2 = Zn + H_2O$
$2Zn + O_2 = 2ZnO$
$Zn + 2HCl = ZnCl_2 + H_2$
$ZnCl_2 + 2NaOH = 2NaCl + Zn(OH)_2$
5. $2Pb + O_2 = 2PbO$
$PbO + 2HCl = PbCl_2 + H_2O$
$PbCl_2 + 2NaOH = 2NaCl + Pb(OH)_2$
$Pb(OH)_2 =^t PbO + H_2O$
$Pb + 2HCl = PbCl_2 + H_2$
6. $BaCl_2 + 2KOH = KCl + 2Ba(OH)_2$
$Ba(OH)_2 =^t BaO + H_2O$
$BaO + H_2 = Ba + H_2O$
$2Ba + O_2 = 2BaO$
$Ba + 2HCl = BaCl_2 + H_2$
$BaCl_2 + H_2SO_4 = 2HCl + BaSO_4$