Given: Zn^2+ (aq) + 2e^- rightarrow Zn(s); E degree = -0.76 V Cu^2+ (aq) + 2e^-

Question

Given: Zn^2+ (aq) + 2e^- rightarrow Zn(s); E degree = -0.76 V Cu^2+ (aq) + 2e^- rightarrow Cu(s); E degree = 0.34 V Cr_2O_7^2- (aq) + 14H^+(aq) + 6e^- rightarrow 2Cr^3+ (aq) + 7H_2O(l); E degree = 1.33 V Which of the following species is the strongest oxidizing agent? Zn^2+ Zn Cu Cr_2O_7^2- Cr^3+ Given: Pb^2+ (aq) + 2e^- rightarrow Pb(s); E degree = -0.13 V Mg^2+(aq) + 2e^- rightarrow Mg(s); E degree = -2.38 V Ag^+(aq) + e^- rightarrow Ag(s); E degree = 0.80 V 2H^+ (aq) + 2e^- rightarrow H_2(g); E degree = 0.00 V Under standard-slate conditions, which of the following species is the best reducing agent? Pb Mg^2+ Ag^+ Ag H_2

Explanation / Answer

35. A chemical species with higest reduction potential is strongest oxidizing agent. In the given set of species,     Cr2O7- - is having highest reduction potential. Therefore, Cr2O7- - is strogest oxidizing agent.

36. A chemical species with lowest reduction potential is strongest reducing agent. In the given set of species, Mg++ has the lowest reduction potential. Therefore, it is the best reducing agent.   

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