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237
*5.
Ans.
*6.
Ans.
*7.
How does molar conductivity of an electrolyte vary with concentration?
Refer 4.2 (d) 1.
How does the variation in molar conductivity of an electrolyte with concentration differs for strong
and weak electrolytes? OR How is the molar conductivity of strong electrolytes at zero concentration
determined by graphical method? Why is this method not useful for weak electrolytes?
Refer 4.2 (d) 2.
Ans.
Explain the different behaviour of strong and weak electrolytes towards the variation of
conductivity with concentration.
Refer 4.2 (c) 2.
State and explain Kohlrausch law of independent migration of ions. How is it useful to determine
the molar conductivity of weak electrolytes at zero concentration?
Refer 4.2 (e) and (f).
*9.
Ans.
What is Cell constant? What is its units? How is it determined?
Refer 4.2 (h) 2 and 3
Ans.
*8.
Multiple Choice Questions :
•
*1.
Theoretical MCQs :
The SI unit of molar conductivity is ........
a) S cm2 mol–1
b) S dm2 mol–1
c) S m2
d) S m2 mol–1
The molar conductance of solution of an electrolyte is measured in ........
a) ohm cm mol–1
b) ohm–1 cm–1 mol–1
c) ohm cm–1 mol–1
d) ohm–1 cm2 mol–1
2.
•
3.
Numerical MCQs
The distance between two electrodes of a cell is 3.0 cm and area of each electrode is 6.0
cm. The cell constant is ........
a) 2.0
b) 1.0
c) 0.5
d) 18
•
4.
Advanced MCQs
Conductivity (units Siemen’s S) is directly proportional to the area of the vessel and the
concentration of the solution in it and is inversely proportional to the length of the vessel, then
the unit of constant of proportionality is ......
(A.I.E.E.E. 2002)
–1
2
–1
–2
2
a) S m mol
b) S m mol
c) S m mol
d) S2 m2 mol–2
⎡
⎤
Area×Conc.
conductivity×length
S×m
or k =
∴k = 2
=Sm 2 mol –1 ⎥
⎢ Hint:Conductivity = k×
–3
length
area×conc.
m ×mol
⎣
⎦
Chapter - 4 Electrochemistry
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