1) For hydrogen -oxygen fuel cell, the cell reaction is 2H2(0)+O2(g)→2H2O(l) if △G0f(H2O)=−237.2kJmol−1 , then emf of this cell is A) +2.46 V B) -2.46 V C) +1.23 V D) -1.23 V Answer: Option CExplanation: We know △ G0= -nFE0 ∴ E0=△G0nF =+237.2×1000J2×96500=1.23V[∴n=2]