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InterviewSolution
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Which of the following changes will cause the free energy of a cell reaction to decrease ? `Zn|ZnSO_(4)(aq)(x_(1)M)||HCl(aq)(x_(2)M)|H_(2)(g),Pt`.A. Increase in the volume of `HCl` solution from `100mL` to` 200mL`B. Increase in the pressure of hydrogen from `1 atm ` to `2 atm`C. Increase in molarity `x_(2)` from `0.1 ` to `1M`D. Increase in molarity `x_(1)` from `1M` to `0.1M`. |
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Answer» Correct Answer - c,d `Zn|Zn^(2+)(x_(1)M)||H^(o+))|H_(2)(g),Pt` Free energy to decrease `implies` cell is more spontaneous `(E_(cell)uarr)` `Zn+2H^(o+)(x_(2)M) rarr Zn^(2+)(x_(1)M)+H_(2(g))` `implies E_(cell)=E^(c-)._(cell)-(0.059)/(2) log .([Zn^(2+)]p_(H_(2)))/([H^(o+)]^(2))` `DeltaG=-ve or E_(cell)=+ve` `c.` When `x_(2)(0.1M)` changed to `1M`. `d.` When `x_(1)(1M)` changed to `0.1M`. |
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