1
MCQ (Single Correct Answer)

AIPMT 2000

Equivalent conductances of Ba2+ and Cl$$-$$ ions are 127 and 76 ohm$$-$$1 cm$$-$$1 eq$$-$$1 respectively. Equivalent conductance of BaCl2 at infinite dilution is
A
139.5
B
101.5
C
203
D
279

Explanation

According to Kohlrausch’s law, the equivalent conductance of BaCl2 at infinite dilution,

$$\lambda $$$$\infty $$ of BaCl2 = $${1 \over 2}$$$$\lambda $$$$\infty $$ of Ba2+ + $$\lambda $$$$\infty $$ of Cl-

$$ \Rightarrow $$ $$\lambda $$$$\infty $$ of BaCl2 = $${1 \over 2} \times 127 + 76$$ = 139 5

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