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Fe2+ +2OH- +2H+ +2Br- --->Fe2+ +2Br- +2H2O
2OH- +2H+ --->2H2O
b)2NaOH+H2SO3--->Na2SO3+2H2O
2Na+ +2OH- +2H+ +SO3 2- --->2Na+ +SO3 2- +2H2O
2OH- +2H+ --->2H2O
b)2 NaOH + H2SO3-> Na2SO3+2H2O