Answers: 3
is sodium hydroxide, charge of sodium is +1, charge of hydroxide is -1, so it's fine;
is sulfuric acid, charge of hydrogen cation is +1, charge of sulfate is -2, sulfate is balanced by the two protons;
is firstly a molecule, it's water, in its liquid state, the oxidation state of +1 for the two hydrogens is balanced by the oxidation state of -2 for oxygen;sodium sulfate should be 
, since sulfate has a charge of -2, this would require two sodium cations to balance it.
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Naoh (aq) + h2so4 (aq) > h2o + naso4 (aq)...
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