JEE MainChemistryElectrochemistryNumerical+4 / −1
A constant current was passed through a solution of ion between gold electrodes. After a period of 10.0 minutes, the increase in mass of cathode was . The total charge passed through the solution is . (Given atomic mass of )
Numerical answer
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Correct answer: 2
- Identify the cathode reaction
At the cathode, gold is deposited from :
So, 1 mole of Au requires 3 moles of electrons.
- Calculate moles of gold deposited
Given mass of Au deposited =
Molar mass of Au =
- Calculate moles of electrons passed
Since 1 mol Au needs 3 mol ,
- Convert to faradays
1 faraday = 1 mole of electrons.
Therefore, total charge passed =
- Fill in the blank
The question asks for
So the required integer is:
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