Q. 50

Match the terms given in Column I with the units given in Column II.


Answer :

(i) Λm (c) S cm2 mol-1


Here, Λm represents the molar conductivity.


Molar conductivity is expressed as Conductivity of the solution divided by its concentration.


Thus,


Λm = = = S cm2 mol-1


(ii) Ecell (d) V


Here, Ecell represents the emf (electromotive force) of the cell and is expressed as the difference of the potential of the two half cells i.e., cathode and anode. Thus, the unit of Ecell is equalto ‘Volt’ and is denoted as ‘V’.


(iii) κ (a) S cm-1


Here, κ (kappa) denotes the conductivity or the specific conductance of the cell.


We know, Resistance (R) = ρ =


Or, κ = G = = S cm-1


Where, ρ = Resistivity or specific resistance =


L= Distance between the electrodes = length


A= Area of cross section of the electrode


G= = Conductance


S= Siemens= SI unit of conductance


(iv) G* (b) m-1


Here, G* represents the cell constant.


We know, G* =


Or, G*= Conductivity x Resistance = x Ω


= S m-1 x S-1 (Since, Ω = S-1)


= m-1


Where, Ω is the SI unit of resistance.


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