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° ∧ m for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm 2 mol –1 , respectively. If the conductivity of 0.001 M HA is- 5 × 10 –5 S cm –1 , degree of dissociation of HA is -

1. 0.50
2. 0.125
3. 0.25
4. 0.75

Correct answer: 0.125

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