In Which Reaction Does the Oxidation Number of Hydrogen Change

question 1

Multiple Choice

In which reaction does the oxidation number of hydrogen change?

• A)HCl (aq)+ NaOH (aq)→ NaCl (aq)+ H₂O (l)
• B)2Na (s)+ 2H₂O (l)→ 2NaOH (aq)+ H₂ (g)
• C)CaO (s)+ H₂O (l)→ Ca(OH)₂ (s)
• D)2HClO₄ (aq)+ CaCO₃ (s)→ Ca(ClO₄)₂ (aq)+ H₂O (l)+ CO₂ (g)
• E)SO₂ (g)+ H₂O (l)→ H₂SO₃ (aq)

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