NTA Abhyas NEET2020ChemistryElectrochemistryPractice
Consider the following electrochemical cell at 298 K A g ( s ) | A g I ( s ) | I - ( a q ) | | C l - ( a q ) | H g 2 C l 2 | H g ( l ) P t ( s ) [Given E C l - | H g 2 C l 2 | H g o = 0.26 V . E A g + / A g o = 0.8 V , K s p ( A g I ) = 1 0 - 16 and 2.303 R T F = 0.06 ] The overall reaction occurring in the above cell is
Options
- A1 2 H g 2 C l 2 ( s ) + A g ( s ) + I - ( a q ) → H g ( l ) + C l - ( a q ) + A g I ( s )
- BA g + ( a q ) + I - ( a q ) → A g I ( s )
- CH g 2 2 + ( a q ) + I 2 C l - ( a q ) → H g 2 C l 2 ( s )
- DCell reaction is not possible
Correct answer
A. 1 2 H g 2 C l 2 ( s ) + A g ( s ) + I - ( a q ) → H g ( l ) + C l - ( a q ) + A g I ( s )
Step-by-step solution
Anode A g + I - → A g I + e - Cathode H g 2 C l 2 + 2 e → 2 H g + 2 C l - Hence, The overall reaction occurring in the above cell is 1 2 H g 2 C l 2 ( s ) + A g ( s ) + I - ( a q ) → H g ( l ) + C l - ( a q ) + A g I ( s )