Which statements are correct given below?
Ionic compounds are less soluble in $D_{2} O$ .
The temperature of maximum density of $H_{2} O$ is less than that of $D_{2} O$ .
$K_{w}$ of $H_{2} O$ is more than $K_{w}$ of $D_{2} O$ .

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2,3

1,2,3

1,2

1,3

answer is C.

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Detailed Solution

In spite of having a greater electro-negativity difference across the O-D bond in comparison to O-H bond, dielectric constant of water is 78.39, higher than that of heavy water whose value is 78.06. This little difference in property is due to the difference in their molar masses.Such difference in properties arising due to difference in their molar masses is termed as isotopic effect.
Ionic compounds are more soluble in solvents having higher dielectric constant.
Dielectric constant is also known as Relative permittivity.
${(K_{w})}_{H_{2} O} = 10^{- 14}$ ; ${(K_{w})}_{D_{2} O} = 1.3 \times 10^{- 15}$ .
Maximum density of water is exhibited at $4^{\circ} C$ while maximum density of heavy water is exhibited at $11 . 5^{\circ} C$ .
Maximum density of water is 1gm/ml while that of heavy water is 1.1gm/ml.