4. The equation 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O is an oxidation-reduction reaction. Which statement is true? (A) the carbon is reduced, and the oxygen is oxidized (B) the carbon is oxidized, and the hydrogen is reduced (C) the carbon is oxidized, and the oxygen is reduced (D) it is a decomposition reaction

5. $$\text{Cu(NO}_3)_2(aq) + 2\text{NaOH}(aq) \rightarrow \text{Cu(OH)}_2(s) + 2\text{NaNO}_3(aq)$$ Which one is the net ionic equation? (A) $$\text{Cu}_2^+(aq) + 2\text{NO}_3^-(aq) \rightarrow \text{Cu(NO}_3)_2(aq)$$ (B) $$\text{Cu}_2^+(aq) + 2\text{OH}^-(aq) \rightarrow \text{Cu(OH)}_2(s)$$ (C) $$2\text{NO}_3^-(aq) + 2\text{Na}^+(aq) \rightarrow 2\text{NaNO}_3(aq)$$ (D) $$\text{Na}^+(aq) + \text{OH}^-(aq) \rightarrow \text{NaOH}(s)$$

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