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In which reaction does the oxidation number of hydrogen change?
O 2HCIO4 (aq) + CaCO3 (s)
Ca(CIO4)2 (aq) + H₂O (1) + CO2(g)
O CaO (s) + H₂O (1)
Ca(OH)2 (s)
O HCl(aq) + NaOH (aq)
NaCl (aq) + H₂O (1)
O SO2 (g) + H₂O (1)
H₂SO3 (aq)
O 2Na (s) + 2H₂O (1)
2NaOH (aq) + H2 (g)

In which reaction does the oxidation number of hydrogen change O 2HCIO4 aq CaCO3 s CaCIO42 aq HO 1 CO2g O CaO s HO 1 CaOH2 s O HClaq NaOH aq NaCl aq HO 1 O SO2 class=


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