Class 12 Chemistry MCQ Chapter 2 Electrochemistry
Are you looking for AHSEC Class 12 Chemistry MCQ Chapter 2 Electrochemistry English Medium? If yes, then you have come to the right place. This article provides a complete collection of Multiple Choice Questions (MCQs) with accurate answers and explanations from Chapter 2: Electrochemistry for AHSEC Higher Secondary students.
These MCQ solutions are prepared according to the latest AHSEC syllabus and examination pattern. The questions cover all important topics of Electrochemistry, including electrochemical cells, galvanic cells, electrode potential, Nernst equation, conductance, electrolytic cells, batteries, fuel cells, and corrosion. Regular practice of these objective questions will help students strengthen their conceptual understanding and improve their problem-solving skills.
All questions and answers are written in simple and easy-to-understand English, making them ideal for quick revision and effective exam preparation. Whether you are preparing for unit tests, school examinations, competitive exams, or the AHSEC Higher Secondary Final Examination 2027, these MCQ solutions will help you build confidence and score higher marks.
Practice these Chapter 2 Electrochemistry MCQs regularly to identify important concepts, improve accuracy, and perform better in examinations.
Part I
Electrochemistry
VSA & MCQ
I. Short Question-Answer
Q. What is electrochemistry?
Ans: It is the study of relationship between chemical reactions and electrical energy.
Q. What is an electrochemical cell?
Ans: A device in which chemical energy is converted into electrical energy.
Q. What is a galvanic cell?
Ans: A cell that converts chemical energy into electrical energy spontaneously.
Q. What is an electrolytic cell?
Ans: A cell that uses electrical energy to carry out non-spontaneous reactions.
Q. What is oxidation?
Ans: Loss of electrons.
Q. What is reduction?
Ans: Gain of electrons.
Q. What is anode?
Ans: Electrode where oxidation occurs.
Q. What is cathode?
Ans: Electrode where reduction occurs.
Q. What is salt bridge?
Ans: A device that maintains electrical neutrality in a cell.
Q. What is cell potential (Ecell)?
Ans: Potential difference between two electrodes of a cell.
Q. What is standard electrode potential?
Ans: Electrode potential measured under standard conditions (1 M, 1 atm, 298 K).
Q. Write the expression for cell EMF.
Ans: Ecell = Ecathode − Eanode
Q. What is Nernst equation?
Ans: It relates cell potential with concentration of reactants and products.
Q. Write Nernst equation.
Ans: E = E° − (0.0591/n) log Q
Q. What is conductivity?
Ans: Ability of a substance to conduct electricity.
Q. What is specific conductance (κ)?
Ans: Conductance of a solution of unit length and unit area.
Q. What is molar conductivity (Λm)?
Ans: Λm = κ × 1000 / C
Q. Unit of molar conductivity?
Ans: S cm² mol⁻¹
Q. What is Kohlrausch’s law?
Ans: At infinite dilution, molar conductivity is sum of ionic conductivities.
Q. What is electrolysis?
Ans: Chemical decomposition using electric current.
Q. State Faraday’s first law.
Ans: Amount of substance deposited is proportional to charge passed.
Q. State Faraday’s second law.
Ans: Amounts of different substances deposited are proportional to their equivalent weights.
Q. What is faraday (F)?
Ans: Charge of one mole of electrons (96500 C).
Q. What is battery?
Ans: A combination of cells producing electrical energy.
Q. What is primary cell?
Ans: Cell that cannot be recharged.
Q. What is secondary cell?
Ans: Rechargeable cell.
Q. What is corrosion?
Ans: Deterioration of metal due to chemical reactions.
Q. What is rusting?
Ans: Corrosion of iron in presence of moisture and oxygen.
Q. What is fuel cell?
Ans: Cell that converts chemical energy of fuel into electricity.
Q. What is overpotential?
Ans: Extra potential required beyond the theoretical value.
II. Multiple Choice Questions (MCQs)
Q. Oxidation occurs at:
(a) Anode
(b) Cathode
(c) Salt bridge
(d) Electrolyte
Ans: (a)
Q. Reduction occurs at:
(a) Anode
(b) Cathode
(c) Electrolyte
(d) Wire
Ans: (b)
Q. Unit of EMF is:
(a) Ampere
(b) Volt
(c) Ohm
(d) Coulomb
Ans: (b)
Q. Nernst equation is used to calculate:
(a) Current
(b) Resistance
(c) Cell potential
(d) Charge
Ans: (c)
Q. Conductivity decreases with dilution for:
(a) Strong electrolytes
(b) Weak electrolytes
(c) Both
(d) None
Ans: (a)
Q. Molar conductivity increases with dilution due to:
(a) Decrease in ions
(b) Increase in mobility
(c) Decrease in volume
(d) Increase in pressure
Ans: (b)
Q. Faraday constant is:
(a) 96500 C
(b) 1 C
(c) 1000 C
(d) 10 C
Ans: (a)
Q. Salt bridge contains:
(a) Acid
(b) Base
(c) Electrolyte
(d) Water
Ans: (c)
Q. Electrolysis involves:
(a) Spontaneous reaction
(b) Non-spontaneous reaction
(c) No reaction
(d) Only oxidation
Ans: (b)
Q. Corrosion is:
(a) Physical change
(b) Chemical change
(c) Nuclear change
(d) Mechanical change
Ans: (b)
Q. Primary cell is:
(a) Rechargeable
(b) Non-rechargeable
(c) Reversible
(d) Infinite
Ans: (b)
Q. Secondary cell is:
(a) Non-rechargeable
(b) Rechargeable
(c) Single use
(d) None
Ans: (b)
Q. Unit of molar conductivity:
(a) S cm² mol⁻¹
(b) S cm⁻¹
(c) Ohm
(d) Volt
Ans: (a)
Q. Assertion: Oxidation occurs at anode.
Reason: Anode loses electrons.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (b)
Q. Assertion: Reduction occurs at cathode.
Reason: Cathode gains electrons.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (d)
Q. Assertion: EMF depends on concentration.
Reason: Nernst equation includes concentration.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (c)
Q. Assertion: Molar conductivity increases with dilution.
Reason: Ionic mobility increases.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (a)
Q. Assertion: Electrolysis is non-spontaneous.
Reason: External energy is required.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (b)
Q. Assertion: Corrosion is oxidation.
Reason: Metal loses electrons.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (d)
Q. Assertion: Faraday constant is charge per mole of electrons.
Reason: 1 mole electrons carry 96500 C.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (c)
