1. Tardigrade
  2. Question
  3. Chemistry
  4. The standard (reduction) electrode potentials for metal-metal ion (M/M2+) electrodes P, Q, R and S are respectively -0.44 V, +0.34 V, -0.76 V and -0.25 V The increasing order of their reducing capacities is

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Q. The standard (reduction) electrode potentials for metal-metal ion $ (M/M^{2+}) $ electrodes $ P, Q, R $ and $ S $ are respectively $ -0.44 \, V, +0.34\, V, -0.76\,V $ and $ -0.25 \, V $ The increasing order of their reducing capacities is

J & K CETJ & K CET 2016Redox Reactions

Solution:

More negative the reduction potential of a metal, higher is its reducing capacity. Therefore, the increasing order of reduction capacities is
$\begin{matrix}Q&<&S&<&P&<&R\\ +0.34\,V&&-0.25\,V&&-0.44\,V&&-0.76\,V\end{matrix}$