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In which reaction does the oxidation number of hydrogen change? in which reaction does the oxidation number of hydrogen change? 2hclo4 (aq) + caco3 (s) β ca(clo4)2 (aq) + h2o (l) + co2 (g) cao (s) + h2o (l) β ca(oh)2 (s) hcl (aq) + naoh (aq) β nacl (aq) + h2o (l) 2na (s) + 2h2o (l) β 2naoh (aq) + h2 (g) so2 (g) + h2o (l) β h2so3 (aq)
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