MHT CET Medical202625 April 2026Evening ShiftChemistryElectrochemistryActual
Which of the following cell reactions is exhibited by fuel cell?
Options
- ACd _ (s) + 2 Ni(OH) _ 3(s) CdO _ (s) + 2 Ni(OH) _ 2(s) + 2 H ₂ O _ (l)
- BPb _ (s) + PbO _ 2(s) + 2 H ₂ SO _ 4(aq) 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 + 4 H ^+ 2 Fe ²⁺_ (aq) + 2 H ₂ O _ (l)
Correct answer
C. 2 H _ 2(g) + O _ 2(g) 2 H ₂ O _ (l)
Step-by-step solution
The reaction 2 H _ 2(g) + O _ 2(g) 2 H ₂ O _ (l) represents the overall cell reaction of a hydrogen-oxygen fuel cell. The reaction Cd _ (s) + 2 Ni(OH) _ 3(s) CdO _ (s) + 2 Ni(OH) _ 2(s) + 2 H ₂ O _ (l) occurs in a Nickel-Cadmium cell. The reaction Pb _ (s) + PbO _ 2(s) + 2 H ₂ SO _ 4(aq) 2 PbSO _ 4(s) + 2 H ₂ O _ (l) occurs in a lead storage battery. The reaction 2 Fe _ (s) + O ₂ + 4 H ^+ 2 Fe ²⁺_ (aq) + 2 H ₂ O _ (l) represents the rusting of iron. Answer: 2 H _ 2(g) + O _ 2(g) 2 H ₂ O _ (l)