Use the data in Appendix 2  to answer these questions.

a. Of the ions Ag⁺, Cr2⁺ and Fe²⁺, which one needs the strongest reducing agent to reduce it to metal atoms?

b. Of the atoms Ag, Cr and Fe, which one needs the strongest oxidising agent to oxidise it to an ion?

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Selected standard electrode potentials Electrode reaction Electrode reaction Ag* +e- Ag Mn2+ + 2e= Mn +0.80 - 1.18 Br, + 2e 2Br +1.07 Mno, + 8H* + 5e Mn2+ + 4H,0 +1.52 Ca2+ + 2e Ca -2.87 Ni24 + 2e NI -0.25 Cl, + 2e 201 NO, + 2H* + e 1 NO, + H,0 +1.36 +0.81 CIO + H,0 + 2e= - Cl+ 20H- NO, + 10H* + 8e - NH, +3H,0 +0.89 +0.87 Cr2+ + 2e Cr -0.91 0, + 4H* + 4e 2H,0 +1.23 Cr3+ + 3e Cr 0,+ 2H,0+ 4e = 40H- -0.74 +0.40 Cr,0,7 +14H* + 6e 2Cr* + 7H,0 Pb2+ + 2e Pb +1.33 -0.13 Cut +e Cu Pbo, + 4H* + 2e - Pb2+ + 2H,0 +0.52 +1.47 Cu2+ + e= Cut +0.15 Snt + 2e Sn -0.14 Cu2+ + 2e Cu Sn4+ + 2e Sn2+ +0.34 +0.15 F,+2e"- 2F- so + 4H* + 2e = so, + 2H,0 +0.17 +2.87 Fe++ 2e - Fe S,0,2 + 2e- 2so, -0.44 +2.01 Fe3+ + e - Fe2+ 5,0,- + 2e- 25,0,2 +0.77 +0.09 Fe+ + 3e Fe -0.04 V2+ + 2e V -1.20 2H* + 2e H, V3++ e V2+ 0.00 -0.26 VO2+ + 2H* +e V3+ + H,0 2H,0 +2e H,0, + 2H* + 2e= 2H,0 H, +20H- +0.34 -0.83 +1.77 vo,* + 2H* +e= vo2* + H,0 +1.00 I, + 2e 21- Vo, + 4H* + e= vo2+ + 2H,0 +1.00 +0.54 K*+e=K -2.92 Zn2+ + 2e= Zn -0.76 Mg+ + 2e= Mg -2.38