MHT CET202522 Apr 2025Evening ShiftChemistryElectrochemistryActual
If E ^ ( Al _ ( aq ) ⁺³ Al _ ( s ) )=-1 66 ~V . What is potential of Al _ ( s ) Al ⁺³(0 1 M )+3 e at 298 K ?
Options
- A+1.540 ~V
- B-1.540 ~V
- C+1.679 ~V
- D-1.679 ~V
Correct answer
C. +1.679 ~V
Step-by-step solution
Standard oxidation potential for Al _ ( s ) Al ⁺³_ ( aq ) + 3e⁻ is the negative of the reduction potential: E^ _ ox = -E^ _ red = -(-1.66 , V ) = +1.66 , V . The Nernst equation for oxidation at 298 , K is: E = E^ - 0.0592 n Q For n = 3 and Q = [ Al ⁺³] = 0.1 , M , with (0.1) = -1 : E = +1.66 - 0.0592 3 (-1) = +1.66 + 0.019733 +1.679 , V This matches option C .