How Does the Oxidation Number of Ca Change in the Reaction

question 55

Multiple Choice

How does the oxidation number of Ca change in the reaction: 2 Ca + O₂ → 2 CaO?

• A)It goes from 0 to +2.
• B)It goes from 0 to -2.
• C)It remains 0 in the reactants and products.
• D)There is not enough information to tell.

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