a)Which redox reaction is not spontaneous under standard conditions? a 2 Fe + 3 Br2 → 2 Fe3+ + 6 Br− b 2 Fe3+ + 3 Ni → 2 Fe + 3 Ni2+ c Fe2+ + Ni → Fe + Ni2+ d 2 Fe3+ + Ni → 2 Fe2+ + Ni2+ e All of the above reactions are spontaneous

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Chapter17: Electrochemistry
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Problem 28E: Determine the overall reaction and its standard cell potential at 25 C for these reactions. Is the...
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a)Which redox reaction is not spontaneous under standard conditions?

a

2 Fe + 3 Br2 → 2 Fe3+ + 6 Br−

b

2 Fe3+ + 3 Ni → 2 Fe + 3 Ni2+

c

Fe2+ + Ni → Fe + Ni2+

d

2 Fe3+ + Ni → 2 Fe2+ + Ni2+

e

All of the above reactions are spontaneous

b)Consider the following half-reaction: BrO- → Br- The balanced equation for the half-reaction in basic conditions is: 

a

BrO- + 2H+ + 2e- → Br- + H2O

b

BrO- + 2H+ → Br- + H2O + 2e-

c

BrO- + H2O → Br- + 2OH- + 2e-

d

BrO- + H2O + 2e- → Br- + 2OH-

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