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Comprehension
A sample of water from a large swimming pool has a resistance of \( 10,000 \Omega \) at \( 25^{\circ} \mathrm{C} \), when placed in a conductivity cell. When filled with \( 0.02 \mathrm{M}-\mathrm{KCl} \) solution, the cell has a resistance of \( 100 \Omega \) at \( 25^{\circ} \mathrm{C} \). An amount of \( 585 \mathrm{~g} \) of \( \mathrm{NaCl} \) was dissolved in the pool, which was thoroughly stirred. A sample of this solution gave a resistance of \( 8000 \Omega \). The molar conductivity of \( \mathrm{NaCl} \) at this concentration is \( 125 \Omega^{-1} \mathrm{~cm}^{2} \mathrm{~mol}^{-1} \) and molar conductivity of \( 0.02 \mathrm{M}-\mathrm{KCl} \) is \( 200 \Omega^{-1} \mathrm{~cm}^{2} \mathrm{~mol}^{-1} \).
Conductivity of water (in \( \Omega^{-1} \mathrm{~cm}^{-1} \) ) is
(a) \( 0.4 \)
(b) \( 0.04 \)
(c) \( 0.0004 \)
(d) \( 0.00004 \)
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