Question

Which of the following properties of \( {D}_2{O} \) is less when compared to \( {H}_2{O} \)?

• A. Melting point
• B. Dielectric constant
• C. Enthalpy of vaporization
• D. Viscosity

Hint:

Deuterium oxide (\( {D}_2{O} \)) has slightly different physical properties compared to regular water due to the difference in the hydrogen isotopes.

Answer 1

The Correct Option is B

Deuterium oxide (\( {D}_2{O} \)) has a higher molecular mass compared to normal water (\( {H}_2{O} \)), which leads to slightly different physical properties. While the properties like melting point, enthalpy of vaporization, and viscosity are relatively similar, the dielectric constant of \( {D}_2{O} \) is less than that of \( {H}_2{O} \). This is because the increased mass of deuterium affects the polarizability and the ability to stabilize charges, leading to a lower dielectric constant. 
Final Answer:  Dielectric constant.