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An aqueous solution containing 1 M each of A u 3 + , C u 2 + , A g + , L i + is being electrolysed by using inert electrodes. The value of standard potentials are E A g + / A g o = 0.80 V , E C u + / C u o = 0.34 V and E A u 3 + / A u o = 1.50 V , E L i + / L i o = - 3.03 V with increasing voltage, the sequence of deposition of metals on the cathode will be

Options

  1. ALi, Cu, Ag, Au
  2. BCu, Ag, Au
  3. CAu, Ag, Cu
  4. DAu, Ag, Cu, Li

Correct answer

C. Au, Ag, Cu

Step-by-step solution

Only A u 3 + , A g + and C u 2 + will deposit at cathode. Li will not deposit at cathode because SRP of H 2 is 0.00V, so after C u 2 + , H 2 will evolve at cathode.

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