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 isA. `+1.66V`B. `-3.26V`C. `3.26V`D. `-1.66V` |
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Answer» Correct Answer - D Al is more reactive than Ag, i.e., cell reaction is `Al+3Ag^(+) to Al^(3+)+3Ag` `E_(cell)=E_("cathode")^(@)-E_("anode")^(@)` `=E_(Ag^(+)//Ag)^(@)-E_(Al^(3+)//Al)^(@)` `2.46=0.80-E_(Al^(3+)//Al)^(@)` or `E_(Al^(3+)//Al)^(@)=-1.66V` |
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