Faraday's first law: mass deposited ∝ quantity of electricity. The constant of proportionality (electrochemical equivalent) depends on: MCQ with Answer and Explanation
Faraday's first law: mass deposited ∝ quantity of electricity. The constant of proportionality (electrochemical equivalent) depends on:
A. Time
B. Temperature
C. Current
D. Nature of the substance
Answer: Option D
Solution (By JKExamLibrary)
Electrochemical equivalent (Z) is mass deposited per unit charge. It depends on molar mass and number of electrons transferred (valency). Z = M/(nF). It differs for different substances. Current and time affect total charge but not Z.
Explanation:
H₂S is oxidized (S²⁻ → S, loss of electrons), so it acts as the reducing agent. FeCl₃ is reduced (Fe³⁺ → Fe²⁺) and acts as oxidizing agent. The substance oxidized is the reducing agent.
Explanation:
Across period 3, S (Z=16) to Cl (Z=17) nuclear charge increases, attracting electron cloud more strongly, reducing atomic radius. Number of shells is same (3).
Explanation:
Electroplating is the application of electrolytic cells to deposit a thin, protective, or decorative layer of a metal (like gold, silver, or chromium) onto a conductive object. Electrolysis is the general process of using electricity to drive a non-spontaneous chemical reaction.
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