Q.

The ionization constnat of a weak acid is 1.6 × 10–5 and the molar conductivity at infinite dilution is 380 × 10–4 sm2mol–1. If the cell constant is 0.01m–1, then conductance of 0.01M acid solution is

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a

1.52×105s

b

1.52×104s

c

1.52 s

d

1.52×103s

answer is B.

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Detailed Solution

Ka=2;α=Ka/C=1.6×105/102 =1.6×103=16×104α=4×102=0.04;α=ΛM/ΛM0M=α×M0=0.04×380×104M=K×1000/M
K=M×M1000=0.04×380×104×0.011000K=0.152×107=1.52×108C=K/G=1.52×108/0.01=1.52×106C=1.52×106Sm3=1.52SCm3

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