250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M AgNO3 and 0.1 M AuCl. The solution was electrolyzed at 2 V by passing a current of 1 A for 15 minutes. The metal/met

Question

250 mL of a waste solution obtained from the workshop of a goldsmith contains 0.1 M AgNO3 and 0.1 M AuCl. The solution was electrolyzed at 2 V by passing a current of 1 A for 15 minutes. The metal/metals electrodeposited will be : V . E , V . E o Au / Au o Ag / Ag

(A) silver and gold in proportion to their atomic weights
(B) silver and gold in equal mass proportion
(C) only silver
(D) only gold

Prashant Kotian · Accepted Answer

Correct answer: D. Charge(q) = it F = 60 1   = 900 = 9 F = 0.0093 F No. of moles of Au+ = 0.025 & No. of moles of Ag+ = 0.025 Species with higher value of SRP will get deposited first at cathode. (i) Au+(aqs) + e–  Au(s) 0.025 0.0093 mole so only Au will get deposited.

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