Which of the following is the best reducing agent? A) Ni^2+ B) Ni C)Zn D)Ag Ni^2

Question

Which of the following is the best reducing agent? A) Ni^2+ B) Ni C)Zn D)Ag Ni^2+ (aq) + 2e^- rightarrow Ni(s) -0.23V Zn^2+(aq) + 2e^- rightarrow Zn (s) -0.76 V Ag^+ (aq) + e^- rightarrow Ag(s) 0.80 V Calculate the cell potential for the following reaction under standard conditions: Mg (s) + Cu^2+ (aq) rightarrow Cu (s) + Mg^2+ (aq) Cu^2+ (aq) + 2 e- rightarrow Cu (s) 0.34 V Mg^2+ (aq) + 2 e^- rightarrow Mg (s) -2.37 V A) +2.04 B) -2.04 C) +2.71 D) -1.36 E) +1.36 Which of the following metals will dissolve in nitric acid but not in hydrochloric acid? A) Au B) Ag C) Fe D) Pb E) Ni Balance the following redox reaction if it occurs in acidic solution. What are the coefficients, in front of, H^+ in the balanced reaction? Ni^2+(aq) + NH_4^+(aq) rightarrow Ni(s) + NO_3^-(aq)

Explanation / Answer

20) Metals like copper, Silver, Gold are below the the hydrogen in the activity series and do not displace H and hence do not react with HCl

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