(a) What are the two classifications of batteries ? What is the difference between them ?
(b) The resistanc of `0.01` M NaCl solution at `25^(@)C is 200Omega.` The cell constant of the conductivity cell is unity. Calculate the molar conductivity of the solution.

Explanation

(a) Batteries are classified in :
Primary batteries and secondary batteries
Primary batteries are those in which the redox reaction occurs only once and the cell becomes dead after sometime and cannot be used againd. Example: Lead storage battery and nickel-cadmium storage battery.
(b) `C=0.01MR=200Omega`
`G^(**)("cell constant")[(1)/(a)]=1cm ^(-1)" "K_(c)=((1)/(R))G^(**)" "implies(1)/(200)xx1`
`=(1)/(200)Scm^(-1),^^_(m)=(K_(c)xx1000)/(M)`
`=(1xx1000)/(200xx0.01)" "implies" "^^_(m)=500Scm^(2)mol^(-1)`