TS EAMCET · Chemistry · Electrochemistry

Given ${λ °}_{{Mg}^{2 +}} = 106 S {cm}^{2} {mole}^{- 1}, {λ °}_{{SO}_{4}^{2 -}} = 160 S {cm}^{2} {mole}^{- 1} .$ The value of ${λ °}_{{MgSO}_{4}}$ (in $S {cm}^{2} {mole}^{- 1}$ ) is

A $271.6$
B $212$
C $390$
D $126$

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Answer & Solution

Correct Answer

(B) $212$

Step-by-step Solution

Detailed explanation

This question is based on kohlrauschs law, according to this law, at infinite dilution, when electrolyte is complete dissociated then each ion makes a definite contribution towards molar conductivity of the electrolyte irrespective of the nature of the other ion with which it is…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Given λ°Mg2+=106 S cm2 mole-1, λ°SO42-=160 S cm2 mole-1. The value of λ°MgSO4 (in S cm2 mole-1) is

Step-by-step Solution

Given ${λ °}_{{Mg}^{2 +}} = 106 S {cm}^{2} {mole}^{- 1}, {λ °}_{{SO}_{4}^{2 -}} = 160 S {cm}^{2} {mole}^{- 1} .$ The value of ${λ °}_{{MgSO}_{4}}$ (in $S {cm}^{2} {mole}^{- 1}$ ) is