Which of Faraday's laws of electrolysis states that the mass of substance deposited is directly proportional to the quantity of electricity passed? MCQ with Answer and Explanation
Which of Faraday's laws of electrolysis states that the mass of substance deposited is directly proportional to the quantity of electricity passed?
A. Law of Conservation of Mass
B. Second Law
C. First Law
D. Third Law
Answer: Option C
Solution (By JKExamLibrary)
Faraday's First Law of Electrolysis states that the mass of a substance deposited or liberated at an electrode is directly proportional to the total charge (Q) passed through the electrolyte (m = ZQ, where Z is the electrochemical equivalent). The Second Law relates mass to equivalent weight.
Explanation:
Biological Oxygen Demand (BOD) measures the amount of dissolved oxygen needed by aerobic organisms to break down organic material in water. Clean, unpolluted water has a low BOD, typically less than 5 ppm. Highly polluted water can have a BOD of 17 ppm or much higher, indicating severe organic contamination.
Explanation:
Cu + 4HNO₃ (conc.) → Cu(NO₃)₂ + 2NO₂ + 2H₂O. Dilute HNO₃ gives NO instead of NO₂. Copper does not produce H₂ with HNO₃ because HNO₃ is an oxidizing acid.
Explanation:
From Faraday's first law, m = ZQ, so Z = m/Q. SI unit is kg/C, but practical unit is g/C. It is the mass of substance liberated per unit charge.
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