The three cells with their \(E^\circ_{\text{(cell)}}\) values are given below:
Cells | \(E^\circ_{\text{(cell)}}/V\) | |
(a) | Fe|Fe2+||Fe3+|Fe | 0.404 |
(b) | Fe|Fe2+||Fe3+, Fe2+|Pt | 1.211 |
(c) | Fe|Fe3+||Fe3+, Fe2+|Pt | 0.807 |
1. | –1.212 F, –1.211 F, –0.807 F |
2. | +2.424 F, +2.422 F, +2.421 F |
3. | –0.808 F, –2.422 F, –2.421 F |
4. | –2.424 F, –2.422 F, –2.421 F |
The number of Faradays (F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol–1) is:
1. 2
2. 3
3. 4
4. 1