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QPages 218-219: Q17: HC Verma: Concepts of Physics - Volume 2 Thermal and Chemical Effects of Electric Current Pages 218-219: Q17 Solution: Find the amount of silver liberated at the cathode if 0.500 A…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently fail to convert the given time from hours to seconds before substituting into Faraday's law ($m = ZIt$), leading to an answer that is 3600 times smaller than the correct value. Always ensure time is in seconds when using the electrochemical equivalent in g/C.

Find the amount of silver liberated at the cathode if 0.500 A of current is passed through an AgNO3\text{AgNO}_3 electrolyte for 1 hour. Atomic weight of silver is 107.9 g mol−1107.9 \text{ g mol}^{-1}.

Step-by-Step Verified Solution

**Answer:** Mass of silver = 2.01 g. **Step-by-Step Explanation:** I=0.500I = 0.500 A, t=3600t = 3600 s, ZAg=0.001118Z_{Ag} = 0.001118 g/C. m=ZIt=0.001118×0.5×3600=2.01m = ZIt = 0.001118 \times 0.5 \times 3600 = 2.01 g .

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