- Transistors (A) use a battery with an anode of Zn/Hg and a cathode of HgO + C.
- Hearing aids (B) use a battery with an anode of Zn and a cathode of Carbon.
- Inverters (C) use a hydrogen fuel cell as the energy source.
- Apollo space ship (D) uses a battery with an anode of Pb and a cathode of PbO.
Therefore, the correct matching is .
For the given cell: The standard cell potential of the above reaction is given. The standard reduction potentials are given as: The correct answer is:
Standard electrode potential for couple is +0.15 V and that for the couple is -0.74 V. The two couples in their standard states are connected to make a cell. The cell potential will be:
To calculate the cell potential (), we use the standard electrode potentials of the given redox couples.
Given data: