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JIPMER 2015
Exam
JIPMER
Year
2015
Subject
Chemistry
Chapter
Electrochemistry

JIPMER 2015 · Chemistry · Electrochemistry

A student made the following observations in the laboratory. I....

A student made the following observations in the laboratory. I. Clean copper metal did not react with 1 molar Pb(NO3)2\mathrm{Pb}\left(\mathrm{NO}_3\right)_2 solution II. Clean lead metal dissolved in a 1 molar AgNO3\mathrm{AgNO}_3 solution and crystals of Ag metal appeared III. Clean silver metal did not react with 1 molar Cu(NO3)2\mathrm{Cu}\left(\mathrm{NO}_3\right)_2 solution The order of decrease in reducing character of three metals is

Options

  1. APb,Cu,Ag\mathrm{Pb}, \mathrm{Cu}, \mathrm{Ag}
  2. BPb,Ag,Cu\mathrm{Pb}, \mathrm{Ag}, \mathrm{Cu}
  3. CCu,Ag,Pb\mathrm{Cu}, \mathrm{Ag}, \mathrm{Pb}
  4. DCu,Pb,Ag\mathrm{Cu}, \mathrm{Pb}, \mathrm{Ag}

Correct answer

A. Pb,Cu,Ag\mathrm{Pb}, \mathrm{Cu}, \mathrm{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∘E^{\circ} value containing metals have the high reducing character. Thus, order of reducing character of three metals is Pb>Cu>Ag\mathrm{Pb}\gt\mathrm{Cu}\gt\mathrm{Ag}
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