The molar conductance of NaCl, HCI, and CH3COONa at infinite dilution are 126.45, 426.16, and 91.0 S cm mol-1 respectively. The molar conductance of CH3COOH at infinite dilution will be:

1. 698.28 S cm2 mol-1

2. 540.48 S cm2 mol-1

3. 201.28 S cm2 mol-1

4. 390.71 S cm2 mol-1

  

Subtopic:   Kohlrausch Law & Cell Constant |
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The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol-1. The dissociation constant of acetic acid is -

(\(\mathrm{\Lambda_{H^{+}}^{o} \ = \ 350 \ S \ cm^{2} \ mol^{-1} }\))
(\(\mathrm{\mathrm{\Lambda_{CH_{3}COO^{-}}^{o} \ = \ 50 \ S \ cm^{2} \ mol^{-1} }}\))

1. 1.75×10-5 mol L-1 

2. 2.50×10-5 mol L-1 

3. 1.75×10-4 mol L-1 

4. 2.50×10-4 mol L-1 

Subtopic:   Kohlrausch Law & Cell Constant |
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At 25 ºC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm–1cm2 mol–1 and at infinite dilution, its molar conductance is 238 ohm–1 cm2 mol–1. The degree of ionization of ammonium hydroxide at the same concentration and temperature is :
 
1. 20.800%
 
2. 4.008%
 
3. 40.800%
 
4. 2.080%
Subtopic:   Kohlrausch Law & Cell Constant |
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Limiting molar conductivity of NH4OH (i.e., ΛmNH4OH0 is equal to -

1. ΛmNaOH0+ΛmNaCl0-ΛmNaOH0

2. ΛmNaOH0+ΛmNaCl0-ΛmNH4Cl0

3. ΛmNH4OH0+ΛmNH4Cl0-ΛmHCl0

4. ΛmNH4Cl0+ΛmNaOH0-ΛmNaCl0

Subtopic:   Kohlrausch Law & Cell Constant |
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Molar conductivities (°m) at infinite dilution of NaCl, HCl and CH3COONa are 126.4, 425.9 and 91.0 S cm2 mol-1 respectively. (°m)  for CH3COOH  will be:

1.  180.5 S cmmol-1

2.  290.8 S cmmol-1

3.  390.5 S cmmol-1

4.  425.5  S cmmol-1

Subtopic:   Kohlrausch Law & Cell Constant |
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The molar conductance of M32 solution of a weak monobasic acid is 8.0 ohm-1 cmand at infinite dilution is 400 ohm-1 cm2. The dissociation constant of this acid is : 

1. 1.25×10-5

2. 1.25×10-6

3. 6.25×10-4

4. 1.25×10-4

Subtopic:   Kohlrausch Law & Cell Constant |
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Kohlrausch's law states that at:

1. Finite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte.
2. Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte.
3. Infinite dilution, each ion makes definite contribution to conductance of an electrolyte whatever be the nature of the other ion of the electrolyte.
4. Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte.
Subtopic:   Kohlrausch Law & Cell Constant |
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