Pattern 1: Nernst Equation Calculation (2-3 marks/year) NEET provides E°cell, and concentrations of reactants/products at non-standard conditions. The question asks for the actual cell EMF. Strategy: (1) Write the balanced cell reaction; (2) Identify n from the half-reactions; (3) Write Q = [products]/[reactants], excluding pure solids; (4) Apply E = E° − (0.0592/n) log Q. Common trap: writing Q with solids included (Zn, Cu) or getting Q inverted. Example: E°(Zn/Cu) = 1.10 V, [$Zn^{2+}$] = 0.1 M, [$Cu^{2+}$] = 0.01 M → Q = 10 → E = 1.10 − 0.0296 × 1 = 1.07 V.

Pattern 2: Faraday's Law Numericals (1-2 marks/year) Most commonly asked: mass of Cu, Ag, or Al deposited for given I and t. Strategy: Write the half-reaction and identify n; convert t to seconds; apply w = MIt/(nF). Key data to remember: M(Cu) = 63.5, n = 2; M(Ag) = 108, n = 1; M(Al) = 27, n = 3; M(Zn) = 65.4, n = 2. Example: 2 A for 1 hour through $CuSO_{4}$ → w = (63.5 × 2 × 3600)/(2 × 96500) = 2.37 g.

Pattern 3: Kohlrausch's Law (1 mark, moderate frequency) NEET gives three Λ°m values and asks for Λ°m of a weak electrolyte. Strategy: Identify target ions; arrange given electrolytes so unwanted ions cancel algebraically. Example: Λ°m($CH_{3}COOH$) = Λ°m($CH_{3}COONa$) + Λ°m(HCl) − Λ°m(NaCl) = 91 + 426.2 − 126.4 = 390.8 S·$cm^{2}$/mol.

Pattern 4: E°cell and K or $\Delta G$° (1 mark, high frequency) NEET asks to calculate K from E°cell or $\Delta G$° from E°cell. Strategy: log K = nE°/0.0592; $\Delta G$° = −nFE°. Example: E°cell = 1.10 V, n = 2 → log K = 2 × 1.10/0.0592 = 37.2; $\Delta G$° = −2 × 96500 × 1.10 = −212.3 kJ/mol.

Pattern 5: Assertion-Reason on Cell Polarity Anode polarity question: A is true (anode = negative in galvanic), but the reason given that "anode is always negative" is false (anode is positive in electrolytic). Most likely answer: A true, R false (option C).