AIIMS2003ChemistryElectrochemistry
Which of the following reactions is used to make a fuel cell?
Options
- Aaligned & Cd _ (s) +2 Ni ( OH )_ 3(s) & CdO _ (s) +2 Ni ( OH )_ 2(s) + H ₂ O _ (l) aligned
- BPb _ (s) + PbO _ 2(s) +2 H ₂ SO _ 4(a q) 2 PbSO _ 4(s) +2 H ₂ O _ (l)
- C2 H _ 2( ~g ) + O _ 2( ~g ) 2 H ₂ O (l)
- D2 Fe _ (s) + O _ 2(g) +4 H ⁺ _ (a q) 2 Fe ²⁺ _ (a q) +2 H ₂ O _ (l)
Correct answer
C. 2 H _ 2( ~g ) + O _ 2( ~g ) 2 H ₂ O (l)
Step-by-step solution
Fuel cells are galvanic cells in which chemical energy of fuels is directly converted into electrical en ergy. e.g., Hydrogen - oxygen fuel cell.