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Electrochemistry

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Q. If the concentration of Cu²⁺ in a cell is increased, what happens to the cell potential?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In a concentration cell, if the concentration of one half-cell is 0.1 M and the other is 1 M, what is the cell potential?
  • A. 0.059 V
  • B. 0.118 V
  • C. 0.0591 V
  • D. 0.1181 V
Q. In a Daniell cell, which metal acts as the anode?
  • A. Copper
  • B. Zinc
  • C. Silver
  • D. Lead
Q. In a galvanic cell, if the anode reaction is 2Ag⁺ + 2e⁻ → 2Ag, what is the cathode reaction? (2022)
  • A. Cu²⁺ + 2e⁻ → Cu
  • B. Zn²⁺ + 2e⁻ → Zn
  • C. Fe²⁺ + 2e⁻ → Fe
  • D. Pb²⁺ + 2e⁻ → Pb
Q. In a galvanic cell, if the anode reaction is 2H₂ → 4H⁺ + 4e⁻, what is the cathode reaction?
  • A. O₂ + 4e⁻ + 4H⁺ → 2H₂O
  • B. 2H₂O + 4e⁻ → 2H₂ + O₂
  • C. 4H⁺ + 4e⁻ → 2H₂
  • D. 2H₂ + O₂ → 2H₂O
Q. In a galvanic cell, if the anode reaction is Ag⁺ + e⁻ → Ag, what is the cathode reaction?
  • A. Cu²⁺ + 2e⁻ → Cu
  • B. Zn²⁺ + 2e⁻ → Zn
  • C. Fe²⁺ + 2e⁻ → Fe
  • D. Pb²⁺ + 2e⁻ → Pb
Q. In a galvanic cell, if the anode reaction is Zn → Zn²⁺ + 2e⁻, what is the cathode reaction if the cathode is Cu²⁺ + 2e⁻ → Cu?
  • A. Cu → Cu²⁺ + 2e⁻
  • B. Zn²⁺ + 2e⁻ → Zn
  • C. Zn + Cu²⁺ → Zn²⁺ + Cu
  • D. Cu²⁺ + 2e⁻ → Cu
Q. In electrolysis, if 1 mole of electrons is transferred, how many grams of copper can be deposited from Cu²⁺?
  • A. 63.5 g
  • B. 31.75 g
  • C. 127 g
  • D. 159 g
Q. In electrolysis, if the current is 2 A and the time is 30 minutes, how many moles of electrons are transferred?
  • A. 0.1 mol
  • B. 0.2 mol
  • C. 0.3 mol
  • D. 0.4 mol
Q. In electrolysis, the process of oxidation occurs at the: (2023)
  • A. Anode
  • B. Cathode
  • C. Electrolyte
  • D. None of the above
Q. In electrolysis, the process of oxidation occurs at the: (2023) 2023
  • A. Anode
  • B. Cathode
  • C. Electrolyte
  • D. None of the above
Q. In electrolysis, what is produced at the anode when NaCl solution is electrolyzed? (2022)
  • A. Hydrogen gas
  • B. Chlorine gas
  • C. Sodium metal
  • D. Oxygen gas
Q. What is the cell potential of a Daniell cell at standard conditions?
  • A. 1.10 V
  • B. 1.96 V
  • C. 0.76 V
  • D. 0.34 V
Q. What is the cell potential of a galvanic cell with E° = 1.5 V and Q = 10?
  • A. 1.2 V
  • B. 1.0 V
  • C. 1.3 V
  • D. 1.4 V
Q. What is the effect of temperature on the cell potential according to the Nernst equation?
  • A. Increases with temperature
  • B. Decreases with temperature
  • C. No effect
  • D. Depends on the reaction
Q. What is the Faraday's constant value?
  • A. 96485 C/mol
  • B. 96500 C/mol
  • C. 96500 A·s/mol
  • D. 96480 C/mol
Q. What is the Faraday's constant?
  • A. 96485 C/mol
  • B. 96500 C/mol
  • C. 96500 J/mol
  • D. 96485 J/mol
Q. What is the Nernst equation for a cell at 298 K with E° = 0.77 V and [Zn²⁺] = 0.01 M?
  • A. E = 0.77 - 0.0591 log(0.01)
  • B. E = 0.77 + 0.0591 log(0.01)
  • C. E = 0.77 - 0.0591 log(100)
  • D. E = 0.77 + 0.0591 log(100)
Q. What is the Nernst equation used for calculating the cell potential at non-standard conditions? (2023)
  • A. E = E° - (RT/nF)lnQ
  • B. E = E° + (RT/nF)lnQ
  • C. E = E° - (nF/RT)lnQ
  • D. E = E° + (nF/RT)lnQ
Q. What is the Nernst equation used for? (2023) 2023
  • A. Calculating pH
  • B. Determining cell potential
  • C. Measuring current
  • D. Finding resistance
Q. What is the product of electrolysis of water?
  • A. Hydrogen and Oxygen
  • B. Hydrogen and Carbon
  • C. Oxygen and Nitrogen
  • D. Hydrogen and Chlorine
Q. What is the reduction potential of the half-reaction 2H⁺ + 2e⁻ → H₂?
  • A. 0.00 V
  • B. 0.34 V
  • C. 0.76 V
  • D. 1.23 V
Q. What is the relationship between Gibbs free energy (ΔG) and cell potential (E) in electrochemistry?
  • A. ΔG = -nFE
  • B. ΔG = nFE
  • C. ΔG = -E/nF
  • D. ΔG = E/nF
Q. What is the standard electrode potential of the half-reaction Zn²⁺ + 2e⁻ → Zn?
  • A. 0.76 V
  • B. 0.34 V
  • C. -0.76 V
  • D. -0.34 V
Q. What is the standard electrode potential of the hydrogen electrode? (2023) 2023
  • A. 0 V
  • B. 1 V
  • C. 2 V
  • D. 0.5 V
Q. What is the unit of electrical conductivity? (2023)
  • A. Ohm
  • B. Siemens
  • C. Volt
  • D. Ampere
Q. Which of the following is a primary cell? (2023) 2023
  • A. Lead-acid battery
  • B. Nickel-cadmium battery
  • C. Zinc-carbon battery
  • D. Lithium-ion battery
Q. Which of the following statements is true about galvanic cells? (2020)
  • A. They convert chemical energy to electrical energy
  • B. They require an external power source
  • C. They operate only in acidic solutions
  • D. They are always non-spontaneous
Showing 1 to 28 of 28 (1 Pages)

Electrochemistry MCQ & Objective Questions

Electrochemistry is a vital branch of chemistry that deals with the relationship between electricity and chemical reactions. Understanding this topic is crucial for students preparing for various exams, as it frequently appears in both school and competitive exam syllabi. Practicing MCQs and objective questions in Electrochemistry not only enhances conceptual clarity but also boosts your confidence, helping you score better in your exams.

What You Will Practise Here

  • Fundamentals of electrochemical cells and their types
  • Key concepts of oxidation and reduction reactions
  • Understanding standard electrode potentials and Nernst equation
  • Applications of electrochemistry in real-world scenarios
  • Calculation of cell potential and Gibbs free energy
  • Important definitions and terminology in electrochemistry
  • Diagrams illustrating electrochemical processes

Exam Relevance

Electrochemistry is a significant topic in various examinations such as CBSE, State Boards, NEET, and JEE. Students can expect questions related to electrochemical cells, calculations involving cell potential, and theoretical applications. Common question patterns include multiple-choice questions that test both conceptual understanding and numerical problem-solving skills. Familiarity with these patterns through practice can greatly enhance your performance.

Common Mistakes Students Make

  • Confusing oxidation with reduction and vice versa
  • Misunderstanding the application of the Nernst equation
  • Overlooking the importance of standard electrode potentials
  • Errors in calculating cell potential due to incorrect unit conversions
  • Neglecting to review essential definitions and concepts

FAQs

Question: What are the key components of an electrochemical cell?
Answer: An electrochemical cell consists of two electrodes (anode and cathode), an electrolyte, and a salt bridge.

Question: How can I improve my understanding of electrochemistry for exams?
Answer: Regular practice of Electrochemistry MCQ questions and reviewing important concepts will significantly enhance your understanding and retention.

Now is the time to take charge of your exam preparation! Dive into our practice MCQs on Electrochemistry and test your understanding to ensure you are well-prepared for your upcoming exams.

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