Problem: In which reaction does the oxidation number of hydrogen change?1) CaO(s) + H2O(l) → Ca(OH)2(s)2) 2Na(s) + 2H2O(l) → 2NaOh(aq) + H2(g)3) SO2(g) + H2O(l) → H2SO3(aq)4) HCl(aq) + NaOH(aq) → NaCl(aq) + H 2O(l)5) HClO4(aq) + CaCO3(s) → Ca(ClO4)2(aq) + H2O(l) + CO2(g)

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FREE Expert Solution

We are asked to choose from the given reactions where the oxidation state of hydrogen changed.


We must identify the oxidation state of Hydrogen for each reaction, both in the reactant side and the product side. Let us look at each of the reactions and focus on compounds containing Hydrogen.


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Problem Details

In which reaction does the oxidation number of hydrogen change?

1) CaO(s) + H2O(l) → Ca(OH)2(s)

2) 2Na(s) + 2H2O(l) → 2NaOh(aq) + H2(g)

3) SO2(g) + H2O(l) → H2SO3(aq)

4) HCl(aq) + NaOH(aq) → NaCl(aq) + H 2O(l)

5) HClO4(aq) + CaCO3(s) → Ca(ClO4)2(aq) + H2O(l) + CO2(g)