20. Identify the strongest base.
(A)CH₃O^-
(B)CH₃OH
(C)CN^-
(D)H₂O

21. The correct mathematical expression for finding the molar solubility (s) of Sn(OH)2 is: (A) \(2s^2 = K_{sp}\) (B) \(4s^2 = K_{sp}\) (C) \(108s^5 = K_{sp}\) (D) \(4s^3 = K_{sp}\)

22. For which process is \(\Delta S\) negative? (A) evaporation of 1 mol of \(CCl_4(l)\) (B) mixing 5 mL ethanol with 25 mL water (C) compressing 1 mol Ne at constant temperature from 1.5 L to 0.5 L (D) raising the temperature of 100 g Cu from 275 K to 295 K

23. Which metal ion has a d5 electron configuration? (A)Pd2+ (B)Ag+ (C)Fe3+ (D)V2+

24. What is the electron configuration of the Sc(I) ion? (A)[Ar] 4s14d1 (B)[Ar] 3d2 (C)[Ar] 3d13a1 (D)[Ar] 4s2

25. Which is a possible product of the chlorination of butane in the presence of light? (A)C4H9Cl (B)C4H7Cl (C)C4H10Cl2 (D)C4H6Cl2

1. When the following equation is balanced, what is the coefficient for H₂O? $$\text{Ca(OH)}_2(aq) + \text{H}_3\text{PO}_4(aq) \rightarrow \text{Ca}_3(\text{PO}_4)_2(s) + \text{H}_2\text{O}(l)$$ (A)2 (B)3 (C)4 (D)6

2. A substance that, when dissolved in water, produces a solution that conducts electric current very efficiently is called (A) a strong electrolyte (B) a weak electrolyte (C) a strong ion (D) an electrical solute

3. Classify the reaction : $$\text{Cu(NO}_3)_2(aq) + 2\text{NaOH}(aq) \rightarrow \text{Cu(OH)}_2(s) + 2\text{NaNO}_3(aq)$$ (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

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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