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Solution


Q.

Molar conductance of an electrolyte increases with dilution according to the equation:

Λm=Λm∘-Ac

Which of the following statements are true 

(A) This equation applies to both strong and weak electrolytes.  
(B) Value of the constant A depends upon the nature of the solvent.  
(C) Value of constant A is same for both BaCl2 and MgSO4.  
(D) Value of constant A is same for both BaCl2 and Mg(OH)2.  

Choose the most appropriate answer from the options given below:            [2023]
1 (A) and (B) only  
2 (A), (B) and (C) only  
3 (B) and (C) only  
4 (B) and (D) only  

Ans.

(4)

The given equation is applicable only to strong electrolytes. For strong electrolytes, Λm increases slowly with dilution and thus is represented by the given equation. The value of the constant 'A' for a given solvent and temperature depends on the type of electrolyte, i.e., the charge on the cation and anion produced on the dissociation of the electrolyte in the solution. Value of constant 'A' is same for both BaCl2 and Mg(OH)2.