Consider the following regarding processes: array l Zn ^ 2+ +2 e ^ - Zn ( ~s ) ; E ^…

Chemistry · NEET · NTA ExamsRedox Reactions

Consider the following regarding processes:

\[\begin{array}{l} \mathrm{Zn}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Zn}(\mathrm{~s}) ; \mathrm{E}^{\prime \prime}=-0.76 \mathrm{~V} \\ \mathrm{Ca}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Ca}(\mathrm{~s}) ; \mathrm{E}^{\prime \prime}=-2.07 \mathrm{~V} \\ \mathrm{Mg}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Mg}(\mathrm{~s}) ; \mathrm{E}^{\prime \prime}=-2.36 \mathrm{~V} \\ \mathrm{Ni}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Ni}(\mathrm{~s}) ; \mathrm{E}^{\prime \prime}=-0.25 \mathrm{~V} \end{array}\]

The reducing power of the metals increases in the order:

  1. Ca < Zn < Mg < Ni
  2. Ni < Zn < Mg < Ca
  3. Zn < Mg < Ni < Ca
  4. Ca < Mg < Zn < Ni

Answer

(B) Ni < Zn < Mg < Ca

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