3. Classify the reaction : Cu(NO3)2(aq) + 2NaOH(aq) → Cu(OH)2(s) + 2NaNO3(aq) (A)formation of a solid (B) formation of a gas (C) formation of water (D)transfer of electrons

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