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2K + 2H2O ---> 2KOH + H2
K2O + H2O ---> 2KOH
2)
2Na + 2H2O ---> 2NaOH + H2
Na2O + H2O ---> 2NaOH
3)
Sn(OH)4 ... Sn(IV)
Fe(OH)2 ... Fe(II)
Sn(OH)2 ... Sn(II)
Fe(OH)3 ... Fe(III)