Quiz | Electrochemistry
Which of the following statements is incorrect?
Reduction occurs at the cathode
All electrochemical reactions involve the transfer of electrons
It is possible to directly measure the voltage of a single electrode
Electrolysis is a technique that uses electric current to drive an otherwise non-spontaneous chemical reaction
Which of the following statement about salt bridge is correct?
It is an agar gel through which ions cannot pass
It allows charge balance to be maintained in the cell
It is represented by a single vertical bar in a cell diagram
It drives free electrons from one electrode to the other
Why is Standard Hydrogen Electrode (SHE) called as the primary reference electrode?
Its voltage E0 = 0 V
The electrode is a nonreactive metal
Its output potential is independent of the composition of the solution
All of the above
What is the reaction of the zinc-copper cell: Zn (s) | ZnSO4(aq) || CuSO4(aq) | Cu(s)?
ZnSO4 (aq) → Zn2+ (aq) + 2 SO4- (aq)
Zn (s) + Cu2+ (aq) → Cu (s) + Zn2+ (aq)
Cu (s) + Zn2+ (aq) → Zn (s) + Cu2+ (aq)
Cu (s) + ZnSO4 (aq) → Zn (s) + CuSO4 (aq)
What is the half-reaction that occurs at the anode during the electrolysis of sodium bromide?
Na+ + e- → Na
Na → Na+ + e-
Br2 + 2 e- → 2 Br-
2 Br- → Br2 + 2 e-
What is the correct Nernst equation for the reaction: Cu (s) + Zn2+ (aq) → Zn (s) + Cu2+ (aq)?
E = E0 + RT/2F x ln Q
E = E0 – RT/2F x ln Q
E = E0 + RT/F x ln Q
E = E0 – RT/F x ln Q