Match List-I with List-II.
| List-I | List-II |
| (A) Faraday’s first law of electrolysis | (p) Λ°m = ν+λ°+ + ν−λ°− |
| (B) Kohlrausch law of independent migration of ions | (q) The amount of chemical reaction at an electrode is proportional to the quantity of electricity passed |
| (C) Faraday’s second law of electrolysis | (r) ΔrG = −nFEcell |
| (D) Gibbs energy of the cell reaction | (s) The amounts of different substances liberated by the same quantity of electricity are proportional to their chemical equivalent weights |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → A-q, B-p, C-s, D-r
(A) Faraday’s first law of electrolysis — This matches (q) The amount of chemical reaction at an electrode is proportional to the quantity of electricity passed. The first law deals with one substance and the charge passed through it.
(B) Kohlrausch law of independent migration of ions — This matches (p) Λ°m = ν+λ°+ + ν−λ°−. The limiting molar conductivity of an electrolyte is the sum of the contributions of its cations and anions.
(C) Faraday’s second law of electrolysis — This matches (s) The amounts of different substances liberated by the same quantity of electricity are proportional to their chemical equivalent weights. The second law compares different substances under the same charge.
(D) Gibbs energy of the cell reaction — This matches (r) ΔrG = −nFEcell. The reversible work done by a cell equals the decrease in its Gibbs energy, the charge nF multiplied by the emf.
NCERT (2026-27 edition):
Faraday’s Laws of Electrolysis – “(i) First Law: The amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte (solution or melt).”
“(ii) Second Law: The amounts of different substances liberated by the same quantity of electricity passing through the electrolytic solution are proportional to their chemical equivalent weights
\( \displaystyle \left(\frac{\text{Atomic Mass of Metal}}{\text{Number of electrons required to reduce the cation}}\right) \).”
2.4.2 Variation of Conductivity and Molar Conductivity with Concentration – “… The law states that limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte. … In general, if an electrolyte on dissociation gives ν+ cations and ν– anions then its limiting molar conductivity is given by:
\( \displaystyle \Lambda^{\circ}_{m}=\nu_{+}\lambda^{\circ}_{+}+\nu_{-}\lambda^{\circ}_{-} \qquad (2.25) \)”
2.3.2 Electrochemical Cell and Gibbs Energy of the Reaction – “… The reversible work done by a galvanic cell is equal to decrease in its Gibbs energy and therefore, if the emf of the cell is E and nF is the amount of charge passed and ΔrG is the Gibbs energy of the reaction, then
\( \displaystyle \Delta_rG=-nFE_{(cell)} \qquad (2.15) \)”