Question 1

Which of the following best describes a buffer solution?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added.

Question 2

Which equation correctly relates pH and pOH at 25°C?

Accepted Answer

$$pH + pOH = 14$$

Question 3

A student adds NaCl to a saturated solution of AgCl. What happens to the solubility of AgCl?

Accepted Answer

It decreases due to the common ion effect.

Question 4

Which of the following is a strong acid?

Accepted Answer

HNO$$_3$$

Question 5

What is the correct formula for calculating the Gibbs free energy change ($$\Delta G) at $$constant temperature and pressure?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 6

During an acid-base titration, what is true at the half-equivalence point for a weak acid and strong base?

Accepted Answer

pH = pKa

Question 7

Which of the following best describes the second law of thermodynamics?

Accepted Answer

All spontaneous processes increase the entropy of the universe.

Question 8

Which of the following is the correct Nernst equation for a cell at non-standard conditions?

Accepted Answer

$$E = E^\circ - \frac{0.0592}{n} \log Q$$

Question 9

Which of the following statements about galvanic (voltaic) cells is correct?

Accepted Answer

Electrons flow from the anode to the cathode.

Question 10

Which group in the periodic table contains elements that are mostly unreactive?

Accepted Answer

Group 18 (Noble gases)

Question 11

Which of the following is a property of transition metals?

Accepted Answer

They often form colored compounds.

Question 12

What is the oxidation state of iron in $$[Fe(CN)_6]^{4-}$$?

Accepted Answer

+2

Question 13

Which of the following best explains why fluorine has a higher electronegativity than chlorine?

Accepted Answer

Fluorine has a smaller atomic radius and greater effective nuclear charge.

Question 14

Which of the following is the correct expression for the solubility product constant ($$K_{sp}) $$for $$AgCl$$?

Accepted Answer

$$K_{sp} = [Ag^+][Cl^-]$$

Question 15

Which of the following is true about the relationship between $$\Delta G$$ and equilibrium?

Accepted Answer

$$\Delta G = 0 at $$equilibrium

Question 16

Which of the following is a common mistake when working with buffers?

Accepted Answer

Forgetting to use the Henderson-Hasselbalch equation when both acid and base are present.

Question 17

Which of the following best describes the crystal field theory for transition metal complexes?

Accepted Answer

It explains color and magnetism based on d-orbital splitting.

Question 18

Which of the following is the correct formula for calculating pH from $$[H^+]$$?

Accepted Answer

$$pH = -\log[H^+]$$

Question 19

Which of the following is a correct statement about redox reactions?

Accepted Answer

Oxidation is the loss of electrons.

Question 20

Which of the following is a correct interpretation of a very large equilibrium constant ($$K) $$for a reaction?

Accepted Answer

Products are strongly favored at equilibrium.

General Chemistry II: Aqueous Equilibria, Thermodynamics, Electrochemistry, and Main Group/Transition Elements

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