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  4. The dielectric constant of H2O is 80. The electrostatic force of attraction between Na+ and Cl- will be

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Q. The dielectric constant of $H_2O$ is $80$. The electrostatic force of attraction between $Na^+ $ and $ Cl^- $ will be

AIPMTAIPMT 1994Chemical Bonding and Molecular Structure

Solution:

Water is a polar solvent and have dielectric constant $80$.
As $NaCl$ is a polar compound and like dissolves like so, forces of attraction between $Na^+$ and $ Cl^ - $ ion will reduce to $\frac{1}{80}$in water.