Here below some basic MCQ’s about “Conductance, Cell Potential and Nernst equation” with answer explanation which is explained in details. Let’s check one by one which is given below.
MCQ 1: Conductance
Question: What does the conductance of an electrolyte solution primarily depend on?
A) Concentration of ions
B) Temperature of the solution
C) Nature of the ions
D) All of the above
Answer: D) All of the above
Explanation: The conductance of an electrolyte solution depends on several factors: the concentration of ions (more ions lead to higher conductance), the temperature (higher temperatures typically increase ion mobility), and the nature of the ions (different ions have different mobilities).
MCQ 2: Cell Potential
Question: The cell potential (E) of a galvanic cell can be influenced by which of the following factors?
A) Concentration of reactants and products
B) Temperature
C) The type of electrodes used
D) All of the above
Answer: D) All of the above
Explanation: The cell potential is affected by the concentrations of reactants and products (as described by the Nernst equation), temperature (which can affect reaction rates and equilibrium), and the type of electrodes (different materials can have different standard potentials).
MCQ 3: Nernst Equation
Question: The Nernst equation is used to calculate the cell potential under non-standard conditions. What is the general form of the Nernst equation?
A) E = E° – (RT/nF) ln(Q)
B) E = E° + (RT/nF) ln(Q)
C) E = E° + (nF/RT) ln(Q)
D) E = E° – (nF/RT) ln(Q)
Answer: B) E = E° + (RT/nF) ln(Q)
Explanation: The Nernst equation is used to relate the cell potential (E) to the standard cell potential (E°) and the reaction quotient (Q). The correct form includes a positive sign before the logarithmic term, indicating that as the reaction quotient increases, the cell potential decreases.
MCQ 4: Reaction Quotient
Question: In the context of the Nernst equation, what does the reaction quotient (Q) represent?
A) The ratio of the concentrations of products to reactants at equilibrium
B) The ratio of the concentrations of reactants to products at any moment
C) The standard concentrations of products and reactants
D) The change in concentration of reactants over time
Answer: B) The ratio of the concentrations of reactants to products at any moment
Explanation: The reaction quotient (Q) is defined as the ratio of the concentrations (or activities) of products to reactants at any point in the reaction. It helps to determine the direction in which the reaction will proceed to reach equilibrium.
MCQ 5: Standard Cell Potential
Question: What does a positive standard cell potential (E°) indicate about a galvanic cell?
A) The reaction is spontaneous.
B) The reaction is non-spontaneous.
C) The reaction is at equilibrium.
D) The cell is not functioning.
Answer: A) The reaction is spontaneous.
Explanation: A positive standard cell potential indicates that the electrochemical reaction is spontaneous under standard conditions. This means that the cell can generate electrical energy from the chemical reaction occurring within it.
MCQ 6: Electrolytic vs. Galvanic Cells
Question: Which of the following statements correctly differentiates between electrolytic and galvanic cells?
A) Galvanic cells convert chemical energy to electrical energy; electrolytic cells do the opposite.
B) Electrolytic cells produce energy, while galvanic cells consume energy.
C) Galvanic cells require an external power source; electrolytic cells do not.
D) Both cells operate under the same principles and conditions.
Answer: A) Galvanic cells convert chemical energy to electrical energy; electrolytic cells do the opposite.
Explanation: Galvanic cells generate electrical energy from spontaneous chemical reactions, while electrolytic cells require an external power source to drive non-spontaneous reactions.
MCQ 7: Nernst Equation Application
Question: When applying the Nernst equation, which condition must be met to accurately calculate the cell potential?
A) The temperature must be at room temperature.
B) Concentrations of all species must be known.
C) The reaction must be at equilibrium.
D) Only solid reactants are involved.
Answer: B) Concentrations of all species must be known.
Explanation: To use the Nernst equation effectively, you need to know the concentrations (or activities) of the reactants and products to calculate the reaction quotient (Q).
MCQ 8: Standard Electrode Potential
Question: Which of the following represents a standard condition for measuring standard electrode potentials?
A) 1 M concentration for all solutions
B) 1 atm pressure for gases
C) Temperature at 25°C (298 K)
D) All of the above
Answer: D) All of the above
Explanation: Standard electrode potentials are measured under specific conditions: 1 M concentration for solutions, 1 atm pressure for gases, and at a temperature of 25°C (298 K).
MCQ 9: Ion Mobility
Question: Ion mobility in a solution is primarily affected by which factor?
A) The mass of the ion
B) The charge of the ion
C) The viscosity of the solvent
D) All of the above
Answer: D) All of the above
Explanation: Ion mobility is influenced by the mass and charge of the ion, as well as the viscosity of the solvent, since these factors determine how easily ions can move through the solution.
MCQ 10: Cell Notation
Question: In electrochemical cell notation, which of the following correctly describes the components of the cell?
A) Anode | Oxidation | Cathode | Reduction
B) Anode || Cathode
C) Oxidation || Reduction
D) Cathode | Anode
Answer: B) Anode || Cathode
Explanation: In electrochemical cell notation, the anode and cathode are separated by a double vertical line (||), indicating the salt bridge or membrane between them.
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