The next two questions deal with an experiment. An unknown metal ‘X’ is found to react…

Chemistry · JEE Advanced · NTA Exams — Some Basic Concepts in Chemistry


The next two questions deal with an experiment. An unknown metal ‘X’ is found to react spontaneously with 1.0M solution of CuSO4 plating out Cu(s). X does not react with a solution of 1.0M Zn(NO3)2. The half-reactions for these metals are:
\(\mathrm{X}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \longrightarrow \mathrm{X}(\mathrm{~s})\) 
\(\mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \longrightarrow \mathrm{Cu}\) 
\(\mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \longrightarrow \mathrm{Zn}\) 
 
Another metal Y displaces Cu2+ from its aqueous solution but can’t displace Zn2+ from its aqueous solution. Which of the following statements regarding X and Y is correct?
  1. X is stronger reducing agent than Y
  2. X is weaker reducing agent than Y
  3. Both X and Y are weaker reducing agents than Cu
  4. X can be either stronger or weaker reducing agent than Y.

Answer

(D) X can be either stronger or weaker reducing agent than Y.

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