Understanding the Nernst Equation is crucial for students in Class 12 studying Chemistry, particularly when delving into electrochemistry. The Nernst Equation enables chemists to calculate the electromotive force (EMF) of a galvanic cell under any conditions from standard-state conditions. It essentially provides insight into how the concentration of ions affects the voltage of an electrochemical cell. As such, mastering this concept is vital for academic success in chemistry and for practical applications in various scientific fields.
To assist with revision and exam preparation, multiple-choice questions (MCQs) focusing on the Nernst Equation can be incredibly beneficial. This collection of Nernst Equation Class 12 MCQ with Answers is designed to test knowledge and understanding through practical problem-solving scenarios. For those looking for a comprehensive study resource, the Nernst Equation Class 12 MCQ PDF is an excellent tool. It compiles various questions along with detailed explanations, ensuring that learners can practice and master this topic effectively.
Furthermore, this resource not only offers Nernst Equation MCQ with Answers but also provides explanations that help clarify doubts. Each question is crafted to challenge the students and enhance their ability to apply the Nernst Equation in different contexts, ensuring a thorough grasp of the material. Whether you’re preparing for board exams or competitive tests, these MCQs are tailored to help you succeed.
Nernst Equation MCQ with Answers
Q. What does the Nernst equation relate to in electrochemistry?
A) Rate of reaction
B) Equilibrium constant
C) Electrode potential
D) Activation energy
Answer: C) Electrode potential
Q. The Nernst equation is used to calculate:
A) pH of solutions
B) Standard electrode potentials
C) Cell potentials under non-standard conditions
D) Concentration of ions
Answer: C) Cell potentials under non-standard conditions
Q. Which of the following is included in the Nernst equation?
A) Temperature
B) Pressure
C) Catalyst
D) Viscosity
Answer: A) Temperature
Also Read: NCERT Solutions for Class 12
Q. The Nernst equation introduces the dependency of the electrode potential on:
A) Pressure only
B) Temperature only
C) Ion concentration
D) Both temperature and ion concentration
Answer: D) Both temperature and ion concentration
Q. For a half-cell reaction Zn²⁺ + 2e⁻ → Zn(s), what would be the effect on the electrode potential if the concentration of Zn²⁺ is decreased?
A) Increase
B) Decrease
C) No change
D) Initially increase then decrease
Answer: B) Decrease
Q. In the Nernst equation, the factor ‘R’ represents:
A) Rydberg constant
B) Gas constant
C) Reaction quotient
D) Rate constant
Answer: B) Gas constant
Q. What does ‘n’ stand for in the Nernst equation?
A) Number of molecules
B) Number of electrons transferred
C) Natural logarithm base
D) Nitrogen content
Answer: B) Number of electrons transferred
Q. In which unit is the constant ‘F’ in the Nernst equation expressed?
A) Joules
B) Volts
C) Coulombs
D) Moles
Answer: C) Coulombs
Q. What is the significance of the term
in the Nernst equation?
A) It represents the energy required to transfer one mole of electrons.
B) It adjusts the potential for temperature.
C) It denotes the pressure effect on the potential.
D) It is the standard potential of the cell.
Answer: B) It adjusts the potential for temperature.
Q. For a standard hydrogen electrode, the Nernst equation under standard conditions would yield a potential of:
A) 0.00 V
B) 1.00 V
C) 0.59 V
D) -0.76 V
Answer: A) 0.00 V
Q. The logarithmic component of the Nernst equation is important because it accounts for:
A) The effect of ion concentration on electrode potential.
B) The standard state of the reactants and products.
C) The pressure dependency of the reaction.
D) The voltage output of the cell.
Answer: A) The effect of ion concentration on electrode potential.
Q. Which of the following is NOT a correct interpretation of the Nernst equation?
A) It can predict the feasibility of a battery.
B) It calculates the exact amount of reactants used.
C) It helps in determining the cell potential under varying conditions.
D) It incorporates the effects of concentration and temperature on cell potential.
Answer: B) It calculates the exact amount of reactants used.
Q. What is the implication of a ‘negative’ cell potential in the context of the Nernst equation?
A) The cell is not feasible.
B) The reaction is spontaneous.
C) The reaction is non-spontaneous.
D) The cell operates under standard conditions.
Answer: C) The reaction is non-spontaneous.
Q. How does increasing temperature affect the cell potential calculated by the Nernst equation for an endothermic reaction?
A) Increases
B) Decreases
C) No change
D) First decreases, then increases
Answer: A) Increases
Q. For a reaction involving the transfer of 3 electrons, how does the factor
modify the potential if the temperature increases?
A) Increases the potential
B) Decreases the potential
C) No change in potential
D) Makes the cell reversible
Answer: A) Increases the potential
Q. Which component in the Nernst equation accounts for the nature of ions involved in the reaction?
A) R
B) T
C) Q (reaction quotient)
D) F
Answer: C) Q (reaction quotient)
More resources for Class 12
- NCERT Solutions for Class 12 Chemistry
- NCERT Solutions for Class 12 Biology
- NCERT Solutions for Class 12 Maths
- NCERT Solutions for Class 12 Physics
Q. If the cell potential is zero, what does the Nernst equation tell us about the reaction?
A) The reactants and products are in equilibrium.
B) The reaction is very rapid.
C) There are no ions present.
D) It is operating under non-standard conditions.
Answer: A) The reactants and products are in equilibrium.
Q. What is the purpose of the logarithmic term in the Nernst equation when applied to a galvanic cell?
A) To measure the cell’s temperature
B) To adjust for pressure changes
C) To balance electron flow
D) To reflect concentration changes
Answer: D) To reflect concentration changes
Q. In the context of electroplating, how does the Nernst equation assist in process optimization?
A) By determining the voltage needed.
B) By setting the temperature of the solution.
C) By calculating the thickness of the plating.
D) By estimating the time required for plating.
Answer: A) By determining the voltage needed.
Q. Which factor in the Nernst equation is altered to compensate for changes in ion concentration?
A)
B)
C)
D)
Answer: B)
