Question

4. All of the following half-reactions are balanced except

NO3-(aq) + 4H+(aq) + 3e- = NO(g) + 2H2O(l)

H3PO3(aq) + H2O(l) = H3PO4(aq) + 2H+(aq) + 2e-

2Ta(s) + 5H2O(l) = Ta2O5(s) +10H+(aq) + 10e-

2H2O(l) + 2e- = H2(g) + 2OH-(aq)

H2O2(aq) = 2OH-(aq) +2e-

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