Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options given.
| Column I | Column II |
| (a) Dry cell | (i) Spongy lead as anode |
| (b) Ni-Cd cell | (ii) Porous carbon electrodes |
| (c) Fuel cell | (iii) Cd act as anode |
| (d) Lead storage battery | (iv) Zinc acts as anode |
Answer & explanation
Correct answer: option 3
(a) Dry cell: Dry cell is also known as Leclanche cell. Zinc metal acts as anode and inert graphite rod is surrounded by a paste of MnO2 and carbon black as cathode.
(b) Ni-Cd cell: Cd metal act as anode and nickel (III) compounds like NiO(OH) are supported on nickel acts as cathode.
(c) Fuel cell: The fuel (gaseous H2) and oxidising agent (gaseous O2) flow into separate cell compartments. Electrodes are made up of porous carbon impregnated with metallic catalyst.
(d) Lead storage battery: The anode, a series of lead grids packed with spongy lead and cathode, a series of grids packed with leaddioxide 38% by wt. of H2SO4 acts as an electrolyte.