Question

Which of the following reactions is the metal displacement reaction? Choose the right option.

• A. Noble gases have large positive values of electron gain enthalpy
• B. Noble gases are sparingly soluble in water
• C. Noble gases have very high melting and boiling points
• D. Noble gases have weak dispersion forces

Answer 1

The Correct Option is C

To determine which of the following statements is a correct characteristic of noble gases, let's analyze each option one by one:

1. Noble gases have large positive values of electron gain enthalpy: This is incorrect. Noble gases have a complete valence shell and do not readily gain electrons, which results in positive or moderately low electron gain enthalpies since electron addition is not favored.
2. Noble gases are sparingly soluble in water: This is true. Noble gases are nonpolar and do not dissolve well in polar water, making them sparingly soluble.
3. Noble gases have very high melting and boiling points: This is incorrect. Noble gases generally have low melting and boiling points because they are held together by weak dispersion (van der Waals) forces.
4. Noble gases have weak dispersion forces: This is true. Noble gases interact through weak dispersion forces, which explains their low melting and boiling points.

From this analysis, options 2 and 4 are correct, but if we consider the context of the provided 'Correct Answer' choice, it seems there might be an error as the tentative statement about high melting and boiling points does not reflect the inherent properties of noble gases. Typically, noble gases exhibit low melting and boiling points, which are attributed to weak dispersion forces.