NEETChemistryElectrochemistry
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The plots of _ m versus c for aqueous solutions of BaCl ₂ and MgSO ₄ have the same slope at 298 ~K . Reason (R): BaCl ₂ is a 2-1 electrolyte while MgSO ₄ is a 2-2 electrolyte, hence they have different values for the constant ' A ' in the Debye-Hückel-Onsager equation. In the light of the above sta
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
D. (A) is not correct but (R) is correct
Step-by-step solution
The variation of molar conductivity ( _ m ) with concentration for strong electrolytes is given by _ m = _ m ^ - A c . The slope of the _ m versus c plot is -A . The value of the constant ' A ' depends on the type of electrolyte, which is determined by the valency of the cation and anion produced on dissociation. BaCl ₂ dissociates into Ba ²⁺ and 2 Cl ⁻ , making it a 2-1 electrolyte. MgSO ₄ dissociates into Mg ²⁺ and SO ₄²⁻ , making it a 2-2 electrolyte. Since they are different types of electrolytes, they have dif