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Assertion : Kohlrausch's law helps to fi...

Assertion : Kohlrausch's law helps to find the molar conductivity of a weak electrolyte at infinite dilution. Reason: The cell potential of mercury cell is 1.35 V, which remains constant.

A

If both (A) and (R) are correct and (R) is the correct explanation of (A).

B

If both (A) and (R) are correct, but (R) is not the correct explanation of (A).

C

(A) is correct but (R) is wrong

D

If both (A) and (R) are incorrect.

Text Solution

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The correct Answer is:
B
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The cell potential of mercury cell Is 1.35 V, and remain constant during Its life. Give reason.

Assertion: According to Kohlrausch's law, the molar conductance of a strong electrolyte at infinite dilution is sum ofmolar conductivities of its ions. Reason: The current carried by cation and anion is always equal.

It is not possible to determine the molar conductivity of weak electrolyte at infinite dilution (Lambda_m^@) graphically by extrapolation. Justify the statement giving reason.

It is not possible to determine the molar conductivity of weak electrolyte at infinite dilution (Lambda_m^@) graphically by extrapolation. How can this problem be solved? Discuss the principle involved in the method.

It is not possible to determine the moral conductivity of weak electrolyte at infinite dilution (Lambda_m^@) graphically by extrapolation. Calculate the molar conductivity of NH_4OH at infinite dilution if Lambda_m^@ of Ba(OH)_2,BaCl_2 and NH_4Cl are 523.4,280 and 130 ohm^(-1)cm^(-2)mol^(_1) respectively.

Kohlrausch's law helps to determine the degree of dissociation of a weak electrolyte at a given concentration. The molar conductivity Lambda_m of .001M acetic acid is 4.95xx10^(_5)Scm^2mol^(-1) .Calculate the degree of dissociation (alpha) at this concentration if limiting molar conductivity lamda_m^0 for H+is 340xx10^(-5)Scm^2mol^(-1) and CH_3COO^- 50.5xx10^(-5)Scm^2mol^(-1)

Which of the following is/are true a.Specific conductance denotes conductances of 1cm^(3) of a substance b. Specific conductance as well as molar conductance of a solution of an electrolyte increases upon dilution. c. Limiting molar conductivity of a weak electrolyte cannot be determined by extrapolation of the plot of lamda_(m) against sqrt(c) d. Conductance of metals is by movement of free electrons

Kohlrausch’s law Is useful for determining lambda_m^@ of weak electrolytes.The molar conductance at infinite dilution for CH_3COONa , HCI and NaCI are 91, 426.2 and 126.5 ohm^-1 cm^2 moI^-1 respectively at 298K. Calculate the molar conductance of acetic add at infinite dilution.

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