Составить баланс уравнений окислительно восстановительных реакций :
 1) Sn+2NaOH+4H2O=2H2+Na2(Sn(OH)6)    
 2)3H2S+K2Cr2O7+7H2SO4=3S+Cr2(SO4)3+7H2O
3)3Cl2+6KOH=KClO3+5KCl+3H2O
4)2H2S+H2SO3=3S+3H2O

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