MCQ 21: Electrode Types
Question: Which of the following is a common type of reference electrode?
A) Copper electrode
B) Silver-silver chloride electrode
C) Carbon electrode
D) Platinum electrode
Answer: B) Silver-silver chloride electrode
Explanation: The silver-silver chloride electrode is widely used as a reference electrode due to its stable potential and ease of preparation.
MCQ 22: Nernst Equation Temperature Dependence
Question: In the Nernst equation, the term RT/nF accounts for changes in which variable?
A) Concentration
B) Temperature
C) Pressure
D) Volume
Answer: B) Temperature
Explanation: The term RT/nF in the Nernst equation indicates that the cell potential is dependent on temperature, where R is the gas constant, T is the temperature in Kelvin, n is the number of moles of electrons, and F is Faraday’s constant.
MCQ 23: Conductivity Measurement
Question: Which instrument is commonly used to measure the conductivity of a solution?
A) pH meter
B) Conductivity meter
C) Voltmeter
D) Amperometer
Answer: B) Conductivity meter
Explanation: A conductivity meter is specifically designed to measure the electrical conductivity of a solution, indicating its ionic concentration.
MCQ 24: Cell Reaction Direction
Question: In a galvanic cell, the flow of electrons is from:
A) Anode to cathode
B) Cathode to anode
C) Positive to negative terminal
D) None of the above
Answer: A) Anode to cathode
Explanation: Electrons flow from the anode (where oxidation occurs) to the cathode (where reduction occurs) in a galvanic cell.
MCQ 25: Electrolytic Cell Reactions
Question: What type of reaction occurs at the cathode of an electrolytic cell?
A) Oxidation
B) Reduction
C) Neutralization
D) Hydrolysis
Answer: B) Reduction
Explanation: At the cathode of an electrolytic cell, reduction occurs as electrons are gained by the species at the electrode.
MCQ 26: Effect of Temperature on Conductance
Question: Increasing the temperature of an electrolyte solution typically has what effect on its conductivity?
A) Increases conductivity
B) Decreases conductivity
C) No effect on conductivity
D) Depends on the type of electrolyte
Answer: A) Increases conductivity
Explanation: Higher temperatures increase the mobility of ions in solution, leading to greater conductivity.
MCQ 27: Standard Cell Potential Interpretation
Question: A standard cell potential of 0.00 V indicates that:
A) The reaction is highly spontaneous.
B) The reaction is non-spontaneous.
C) The reaction is at equilibrium.
D) The cell is malfunctioning.
Answer: C) The reaction is at equilibrium.
Explanation: A standard cell potential of 0.00 V suggests that there is no net driving force for the reaction, indicating that it is at equilibrium.
MCQ 28: Reaction Quotient Calculation
Question: If the concentrations of products in a redox reaction are significantly higher than those of the reactants, what will happen to the reaction quotient (Q)?
A) Q will decrease
B) Q will remain constant
C) Q will increase
D) Q will become zero
Answer: C) Q will increase
Explanation: When the concentrations of products are much higher than those of reactants, the reaction quotient (Q) increases, which can affect the cell potential according to the Nernst equation.
MCQ 29: Half-Cell Reactions
Question: In a half-cell reaction, which term describes the species being reduced?
A) Oxidant
B) Reductant
C) Electrode
D) Salt bridge
Answer: A) Oxidant
Explanation: The species that gains electrons (is reduced) in a half-cell reaction is referred to as the oxidant.
MCQ 30: Conductance in Solutions
Question: Which type of electrolyte is characterized by partial dissociation in solution?
A) Strong electrolyte
B) Weak electrolyte
C) Nonelectrolyte
D) Solvent
Answer: B) Weak electrolyte
Explanation: Weak electrolytes only partially dissociate into ions when dissolved in water, resulting in lower conductivity compared to strong electrolytes.
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