JEE Main 2020 — Electrochemistry Question with Solution
From: JEE Main 2020 (Online) 9th January Morning Slot
Question
108 g of silver (molar mass 108 g mol–1) is
deposited at cathode from AgNO3(aq) solution
by a certain quantity of electricity. The
volume (in L) of oxygen gas produced at
273 K and 1 bar pressure from water by the
same quantity of electricity is _______.
Enter your answer
Show full solutionCorrect answer: 5.6
Correct answer
5.6
Step-by-step explanation
Cathode : Ag+(aq) + e- Ag(s)
Moles of Ag deposited = = 1 mole
Anode : 2H2O O2 + 4H+ + 4e-
Here we have to find volume of O2 evolved.
Equivalance of Ag = Equivalance of O2
1 1 = nO2 4
nO2 = mol
Volume of O2 evolved
= 22.4
= 5.6 lit
Moles of Ag deposited = = 1 mole
Anode : 2H2O O2 + 4H+ + 4e-
Here we have to find volume of O2 evolved.
Equivalance of Ag = Equivalance of O2
1 1 = nO2 4
nO2 = mol
Volume of O2 evolved
= 22.4
= 5.6 lit
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