InterviewSolution
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InterviewSolution
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Aluminium displaces hydrogen from dilute HCl whereas silver does not. The e.m.f. of a cell prepared by combining `Al//Al^(3+) and Ag//Ag^(+)` is 2.46V. The reduction potential of silver electrode is +0.80V. The reduction potential of aluminium electrode.A. `+1.66V`B. `-3.26V`C. `3.26V`D. `-1.66V` |
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Answer» Correct Answer - D Al displaces H from HCl but silver cannot it means Al is situated above the Ag in ECS, hence Al will acts as anode and Ag will act as cathode. `E_(cell)^(o)=E_("cathode")^(o)-E_("anode")^(o)=E_(Ag^(+)//Ag)^(o)-E_(Al^(3+)//Al)^(o)` `2.46=0.8-E_(Al^(3+)//Al)^(o),E_(Al)^(o)=0.8-2.46=-1.66V`. |
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