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JIPMER2015ChemistryElectrochemistry

A student made the following observations in the laboratory. I. Clean copper metal did not react with 1 molar Pb ( NO ₃ )₂ solution II. Clean lead metal dissolved in a 1 molar AgNO ₃ solution and crystals of Ag metal appeared III. Clean silver metal did not react with 1 molar Cu ( NO ₃ )₂ solution The order of decrease in reducing character of three metals is

Options

  1. APb , Cu , Ag
  2. BPb , Ag , Cu
  3. CCu , Ag , Pb
  4. DCu , Pb , Ag

Correct answer

A. Pb , Cu , Ag

Step-by-step solution

Metal placed above in electrochemical series replaces the other from its salt solution which is lower in the series. The low E^ value containing metals have the high reducing character. Thus, order of reducing character of three metals is Pb Cu Ag

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