Which of the following statements is/are correct? (a) The conductivity of molten \( \mathrm{NaCl...

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Which of the following statements is/are correct?
(a) The conductivity of molten \( \mathrm{NaCl} \) is due to movement of \( \mathrm{Na}^{+} \)and \( \mathrm{Cl}^{-} \)ions.
(b) Solid \( \mathrm{NaCl} \) is good conductor of electricity.
(c) Molten sodium is a good conductor because of mobile electrons.
(d) Resistivity is reciprocal of molar conductivity of electrolyte.
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