The species which has the largest standard(reduction) potential is the strongest

Question

The species which has the largest standard(reduction) potential is the strongest oxidising agent.

The species which has the least standard (reduction) potential is the strongest reducing agent.

A negative Eo means that the redox couple is a stronger reducing agent than the H+/H2 couple.

35. E0 for Zn2+/Zn couple is -0.76 V.

E0 for Zn/Zn2+ couple is 0.76 V.

  E0 for Cu/Cu2+ couple is -0.34 V.

Eo for Cr2O72-/Cr3+ couple is 1.33 V.

Eo for Cr3+/ Cr2O72- couple is -1.33V.

Using the above knowledge, the strongest oxidising agent is Cr2O72-(Option (d)).

36. Similarly, the strongest reducing agent will be Mg2+(Option (b)).

Explanation / Answer

35. Given: 0.34 V Cua"(aq) + 2e Cu(s): Eo 1.33 V Cro-2-(aq) + 14H.(aq) + 6e. 2Cr"(aq) + 7H20(1):F Which of the following species is the strongest oxidizing agent? A) Zn+ B) Zn C) Cu D) Cr:0, E) Cr 36. Given: Mg2+(aq) + 2e. Mg(s); Es-2.38 V Ag+(aq) + e- Ag(s); Eo-0.80 V 2H'(aq) + 2e H2(g); E= 0.00 V Under standard-state conditions, which of the following species is the best reducing agent? A) Pb C) Ag Mg2* D) Ag E) H2

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