Define the following terms :
(i) Molar conductivity `(wedge_(m))`
(ii) Secondary batteries
(iii) Fuel cell
(b) State the following laws :
(i) Faraday first law of electrolysis
(ii) Kohlrausch's law of independent migration of ions.

Explanation

(a) NA
(b) (i) Faraday's first law of electrolysis : "The amount of any substance deposited or liberated at the electrode is directly proportional to the quantity of electricity passing through the electrolye".
If `omega` grams of the substance deposited on passing Q coulmbs of electricity, then
`omega alpha Q or omega alpha I xxt" " [because Q=Ixxt]`
`omega =ZxxI xxt`
(ii) See Q.28 (a) Delhi Board , set-I, 2010.