Worksheet – 01 (Electrolysis, Electrolytic and Metallic Conduction)
Class: 11th Subject : Chemistry Date: 27/05/2025
Q1. The amount of electricity in Coulomb required for the oxidation of 1 mol of H 2O to O 2 is___ 105 C .
Q2. The mass of silver (Molar mass of Ag :108 g mol1 ) displaced by a quantity of electricity which
displaces 5600 mL of O 2 at S.T.P. will be ____________g.
Q3. The mass of zinc produced by the electrolysis of zinc sulphate solution with a steady current of
0.015 A for 15 minutes is_____________ 104 g . (Atomic mass of zinc =65.4 amu)
Q4. A constant current was passed through a solution of AuCl4 ion between gold electrodes. After a
period of 10.0 minutes, the increase in mass of cathode was 1.314 g . The total charge passed through
the solution is_________ 102 F . (Given atomic mass of Au 197 )
Q5. One Faraday of electricity liberates x 101 gram atom of copper from copper sulphate, x is_____.
Q6. The values of conductivity of some materials at 298.15 K in Sm1 are 2.1 103 ,1.0 1016 ,1.2 10 ,
3.91,1.5 102 ,1 107 ,1.0 103 . The number of conductors among the materials is____________.
Q7. The specific conductance of 0.0025 M acetic acid is 5 105 S cm1 at a certain temperature. The
dissociation constant of acetic acid is___________ 107 (Nearest integer)
Consider limiting molar conductivity of CH3COOH as 400 S cm2 mol1 .
Q8. A metal surface of 100 cm2 area has to be coated with nickel layer of thickness 0.001 mm. A
current of 2 A was passed through a solution of Ni NO3 2 for ' x ' seconds to coat the desired layer.
The value of x is__________. (Nearest integer)
( ρ Ni (density of nickel) is 10 g mL1 , Molar mass of nickel is 60 g mol1,F 96500Cmol1 )
Q9. The number of correct statements from the following is___________.
(A) Conductivity always decreases with decrease in concentration for both strong and weak
electrolytes.
(B) The number of ions per unit volume that carry current in a solution increases on dilution.
(C) Molar conductivity increases with decrease in concentration.
(D) The variation in molar conductivity is different for strong and weak electrolytes.
(E) For weak electrolytes, the change in molar conductivity with dilution is due to decrease in degree of
dissociation.
Q10. The resistivity of a 0.8 M solution of an electrolyte is 5 103 Ω cm . Its molar conductivity
is_________ 104 Ω1 cm2 mol1 . (Nearest Integer)
Q11. Following figure shows dependence of molar conductance of two electrolytes on concentration.
Λ m is the limiting molar conductivity.
1 Topper’s Choice, SCO 76, 2ND Floor, Sec-40-C, CHD
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The number of incorrect statements) from the following is____________.
(A) Λ m for electrolyte A is obtained by extrapolation.
(B) For electrolyte B,Λ m vs c graph is a straight line with intercept equal to Λ m
.
(C) At infinite dilution, the value of degree of dissociation approaches zero for electrolyte B.
(D) Λ m for any electrolyte A or B can be calculated using λ for individual ions.
Q12. Resistance of a conductivity cell (cell constant 129 m1 ) filled with 74.5 ppm solution of KCl is
100Ω (labelled as solution 1). When the same cell is filled with KCl solution of 149 ppm, the resistance
is 50Ω (labelled as solution 2). The ratio of molar conductivity of solution 1 and solution 2 is
Λ1
ie., x 103 . The value of x is____________. (Nearest integer)
Λ2
(Given, molar mass of KCl is 74.5 g mol1 ).
Q13. The resistance of a conductivity cell containing 0.01 M KCl solution at 298 K is 1750Ω . If the
conductivity of 0.01 M KCl solution at 298 K is 0.152 103 S cm1 , then the cell constant of the
conductivity cell is_________ 103 cm1 .
Q14. The limiting molar conductivities of NaI, NaNO3 and AgNO3 are 12.7, 12.0 and 13.3 mS m2 mol1 ,
respectively (all at 25°C). The limiting molar conductivity of AgI at this temperature is____ mSm2 mol1 .
Q15. The solubility product of a sparingly soluble salt A 2 X3 is 1.1 1023 . If specific conductance of the
solution is 3 105 S m1 , the limiting molar conductivity of the solution is x 103 S m2 mol1 . The
value of x is____________.
Q16. If the conductivity of mercury at 0 C is 1.07 106 S m1 and the resistance of a cell containing
mercury is 0.243Ω , then the cell constant of the cell is x 104 m1 . The value of x is__________.
Q17. The resistance of conductivity cell with cell constant 1.14 cm1 , containing 0.001 M KCl at 298 K
is 1500Ω . The molar conductivity of 0.001 M KCl solution at 298 K in S cm 2 mol1 is __________.
Q18. The conductivity of a weak acid HA of concentration 0.001 mol L1 is 2.0 105 S cm1 . If
Λm HA 190 S cm2 mol1 , the ionisation constant K a of HA is equal to__________ 106 .
Q19. A 5.0 mmol dm 3 aqueous solution of KCl has a conductance of 0.55 mS when measured in a
cell of cell constant 1.3 cm1 . The molar conductivity of this solution is__________ mS m2 mol1 .
(Round off to the Nearest Integer).
2 Topper’s Choice, SCO 76, 2ND Floor, Sec-40-C, CHD
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Answer Keys
1. (2) 2. (108) 3. (46) 4. (2) 5. (5)
6. (4) 7. (66) 8. (161) 9. (3) 10. (25)
11. (2) 12. (1000) 13. (266) 14. (14) 15. (3)
16. (26) 17. (760) 18. (12) 19. (14)
3 Topper’s Choice, SCO 76, 2ND Floor, Sec-40-C, CHD
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