Question

The dielectric constant of $H_{2}O$ is $80$. The electrostatic force of attraction between $N{a}^{+}$ and $C{l}^{-}$ will be

• A. reduced to$\frac{1}{40}$ in water than in air
• B. reduced to$\frac{1}{80}$ in water than in air
• C. will be increased to 80 in water than in air
• D. will remain unchanged

Answer 1

Answer: (B)

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 $N{a}^{+}$ and $C{l}^{-}$ ion will reduce to $\frac{1}{80}$in water.