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

Chemistry · JEE Advanced · NTA ExamsSome 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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