Q11 of 26 Page 1

The electrical resistance of a column of 0.05 M KOH solution of diameter 1 cm and length 45.5 cm is 4.55103 ohm. Calculate its molar conductivity.

Given, molarity, M = 0.05 M


Length,l = 45.5 cm


Diameter, d = 1cm and radius = 0.5cm


Electrical resistance, R= 4.55103 ohm


For calculating molar conductivity, ⋀m = … (1)


Where M = molarity and K = conductivity =


Since, R=


=


= = 78.5 ohm cm


Now, conductivity, K =


K= 0.0127 S cm-1


Putting the above value in equation (1), we get,


⋀m = = 245 S cm2mol-1


More from this chapter

All 26 →
9

In a galvanic cell, the following cell reaction occurs:

Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s), E°cell = +1.56 V


(a) Is the direction of flow of electrons from zinc to silver or silver to zinc?


(b) How will concentration of Zn2+ ions and Ag+ ions be affected when the cell functions?


 10

In the following ions: Mn3+, V3+, Cr3+, Ti4+ (Atomic no.: Mn=25, V=23, Cr=24, Ti=22)

(a) Which ion is most stable in an aqueous solution?


(b) Which ion is the strongest oxidizing agent?


(c) Which ion is colorless?


(d) Which ion has the highest number of unpaired electrons?


 12

Define the following terms with an example in each:

(a) Lyophobic colloids


(b) Homogeneous catalysis


(c) O/W emulsion


OR


Write three differences between Physisorption and Chemisorption.


 13

A solution of glucose (Molar mass = 180 g mol–1) in water has a boiling point of 100.20°C. Calculate the freezing point of the same solution. Molal constants for water Kf and Kb are 1.86 K kg mol–1 and 0.512 K kg mol–1 respectively.