In which reaction does oxidation number of hydrogen change

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Reference no: EM13173071

In which reaction does the oxidation number of hydrogen change?

HCl (aq) + NaOH (aq) ? NaCl (aq) + H2O(l)

SO2(g) + H2O(l) --> H2SO3(aq)

2HClO4(aq) + CaCO3(s) --> Ca(ClO4)2(aq) + H2O(l) + CO2(g)

CaO(s) + 2H2O(l) --> Ca(OH)2(s)

2Na(s) + 2H2O(l) --> 2NaOH(aq) + H2(g)

Reference no: EM13173071

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