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Consider the following half-reactions and their reduction potentials (volt Au (aq) +3e- Au(s) +1.50 petad) +2 e → Pt(s) +1.2
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Option B is correct. In above question reduction potential values are given from the values if positive reduction potential is their strong oxidising agent and negative reduction potential shows strong reducing agent.in option B Pt shows +1.20 which is potive reduction potential and Co shows -0.28 which is negative and hence Pt2+ is reduce by Co(s)

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