NEETChemistryElectrochemistry
Given below are two lists regarding the variation of molar conductivity ( _ m ) with concentration for electrolytes. List-I List-II (A) Intercept on the y-axis for the plot of _ m versus c (I) - A (B) Slope of the plot of _ m versus c for strong electrolytes (II) _ m ^ (C) MgCl ₂ and Ba ( NO ₃)₂ (III) Different value of constant 'A' (D) NaCl and CaCl ₂ (IV) Same value of constant 'A' Choose the correct answer from th
Options
- A(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
- B(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
- C(A)-(II), (B)-(I), (C)-(III), (D)-(IV)
- D(A)-(I), (B)-(II), (C)-(IV), (D)-(III)
Correct answer
B. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
Step-by-step solution
The variation of molar conductivity for strong electrolytes is given by _ m = _ m ^ - A c . Comparing this with the equation of a straight line y = mx + c , the intercept on the y-axis is the limiting molar conductivity ( _ m ^ ) and the slope is - A . The value of the constant 'A' depends on the type of electrolyte (the valency of the cation and anion). MgCl ₂ and Ba ( NO ₃)₂ both dissociate to give one bivalent cation and two univalent anions, making them 2-1 electrolytes. Thus, they have the same value of consta