$word_{count}$: 180

Electrochemistry typically yields 1-2 questions in JEE Main (approximately 5% weightage). Common question types: (1) Nernst equation calculations — find $E_{cell}$ given concentrations or find K from $E_{standard}$ (1 question, 2-3 min). (2) Faraday's law — mass deposited or time required for electrolysis (1 question, 2 min). (3) Kohlrausch/conductivity — find Lambda_m_{infinity} or Ka (less common). Strategy: memorise $E_{standard}$ values for common half-cells, the 0.0592/n factor, and Faraday's mass formula. Common traps: wrong sign convention (always use reduction potentials, don't flip signs), forgetting n in Nernst equation, confusing galvanic and electrolytic cell polarities, and not converting time to seconds in Faraday calculations. Quick checks: $E_{cell}$ > 0 = spontaneous, $delta_G$ < 0 = spontaneous, K > 1 = products favoured. These must all be consistent. For electrolysis of aqueous solutions, remember: active metals don't deposit; H2O is electrolysed instead.