When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are :

Conductivity (Seimen’s S) is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel then, then constant of proportionality is expressed in :

Units of rate constant of first and zero order reactions in terms of molarity M unit are respectively

$$\beta$$ - particle is emitted in radioactivity by