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The variation in Lambdam with concentrat...

The variation in `Lambda_m` with concentration for a strong electrolyte can be represented by the equation, `Lambda_m=Lambda_m^@ -AC^(1//2)` The value of constant A for a given solvent and temperature depends upon the type of electrolyte i.e., cations and anions produced on dissociation of electrolyte in the solution .
Which of the following statements is correct regarding variations of molar conductivity with concentration.

A

Molar conductivity decrease with decrease in concentration

B

Variation is molar conductivity of weak and strong electrolytes is same.

C

Molar conductivity increases with decrease in concentration.

D

When concentration of the solution approaches zero, the molar conductivity is known as conductance.

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The correct Answer is:
C
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Which of the following equations corrects the molar conductivity with concentration for a strong electrolyte?

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Conductors allow the passage of electric current through them. Metallic and electrolytic are the two type of conductors. Current carriers in metallic and electrolytic conductors are free electrons and free ions respectively. Specific conductance or consuctivity of the electrolyte solution is given by the following relation : kappa=c xx l/A where, c=1//R is the conductance and l//A is the cell constant. Molar conductance (Lambda_(m)) and equivalence conductance (Lambda_(e)) of an electrolyte solution are calculated using the following similar relations : Lambda_(m)= kappa xx 1000/M Lambda_(e)= kappa xx 1000/N Where, M and N are the molarity and normality of the solution respectively. Molar conductance of strong electrolyte depends on concentration : Lambda_(m)=Lambda_(m)^(@)-b sqrt(c) where, Lambda_(m)^(@)= molar conductance at infinite dilution c= concentration of the solution b= constant The degrees of dissociation of weak electrolytes are calculated as : alpha=Lambda_(m)/Lambda_(m)^(@)=Lambda_(e)/Lambda_(e)^(@) Which of the following decreases on dilution of electrolyte solution ?

Above plot represents the variation of molar conductance against sqrtC (where C = molar concentration of the electrolyte) . Select the correct option among following .

NCERT FINGERTIPS-ELECTROCHEMISTRY-Conductance Of Electrolytic Solutions
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  2. Match the column I with column II and mark the appropriate choice.

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  5. The molar conductivity is maximum for the solution of concentration .

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  9. The variation in Lambdam with concentration for a strong electrolyte c...

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  10. Two solutions of X and Y electrolytes are taken in two beakers and dil...

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  12. Molar conductivity of NH4OH can be calculated by the equation.

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  13. Limiting molar conductivity of NaBr is

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  15. Limiting molar conductivity for some ions is given below (in S cm^(2) ...

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  16. Match the column I with column II and mark the appropriate choice.

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  20. A weak monobasic acid is 5% dissociated in 0.01 mol dm^(-3) solution. ...

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