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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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)

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Our tutors have indicated that to solve this problem you will need to apply the Calculate Oxidation Numbers concept. You can view video lessons to learn Calculate Oxidation Numbers. Or if you need more Calculate Oxidation Numbers practice, you can also practice Calculate Oxidation Numbers practice problems.

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Based on our data, we think this problem is relevant for Professor Fortney's class at PITT.