NTA Abhyas NEET2020ChemistryElectrochemistryPractice
A l 3 + ( a q ) + 3 e - → A l ( s ) ; E ° = - 1.66 V C u 2 + ( a q ) + 2 e - → C u ( s ) ; E ° = + 0.34 V What voltage is produced under standard conditions by combining the half reaction with these standard electrode potentials?
Options
- A1.32 V
- B2.00 V
- C2.30 V
- D4.34 V
Correct answer
B. 2.00 V
Step-by-step solution
The cell will be A l ( s ) | A l 3 + ( a q ) | | C u 2 + ( a q ) | C u ( s ) E c e l l o = E c a t h o d e o - E a n o d e o = E C u 2 + / C u o - E A l 3 + / A l o = + 0.34 - ( - 1.66 ) = + 2.00 V .