The equivalent conductance at infinite dilution of a weak acid such as HF

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Can be determined by measurement of very dilute HF solution

Can be determined by extrapolation of measurements of dilute solutions of HCl, HBr and HI

Can best be determined from measurement on dilute solutions of NaF, NaCl and HCl

Is an undefined quantity

answer is C.

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Detailed Solution

By Kohlrausch law, if the value of $\land_{NaF}^{0}, \land_{NaCl}^{0} and \land_{HCl}^{0}$ are known, then $\land_{HF}^{0}$ can be determined by

$\land_{HF}^{0}$ = $\land_{HCl}^{0} + \land_{NaF}^{0} - \land_{NaCl}^{0}$

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