KCET2015ChemistryElectrochemistry
In ( H ₂- O ₂ ) fuel cell the reaction occurring at cathode is
Options
- A( .2 H ₂ )(g)+ O ₂(g) 2 H ₂ O (l) )
- B( O ₂(g)+2 H ₂ O (l)+4 e⁻ 4 OH ⁻(a q) )
- C( H⁺+e⁻ 1 2 H₂ )
- D( H ⁺(a q)+ OH ⁻(a q) H ₂ O (l) )
Correct answer
B. ( O ₂(g)+2 H ₂ O (l)+4 e⁻ 4 OH ⁻(a q) )
Step-by-step solution
The reaction occurring in ( H ₂- O ₂ ) fuel cells are: [ array ll At anode : & 2 H ₂(g)+4 OH ⁻(a q) 4 H ₂ O (l)+4 e⁻ At cathode : & O ₂(g)+2 H ₂ O (l)+4 e⁻ 4 OH ⁻(a q) array ] [ Net reaction : 2 H ₂(g)+ O ₂(g) 2 H ₂ O (l) ]