Question

Give below are two statements:
Statement-I : Noble gases have very high boiling points. 
Statement-II: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this they are liquefied at very low temperature. Hence, they have very high boiling points. 
In the light of the above statements, choose the correct answer from the options given below.

• A. Statement I is false but Statement II is true.
• B. Both Statement I and Statement II are true.
• C. Statement I is true but Statement II is false.
• D. Both Statement I and Statement II are false.

Answer 1

The Correct Option is D

To assess the provided statements, it is necessary to first comprehend the characteristics of noble gases and their correlation with boiling points and intermolecular forces.

1. Noble Gases: Noble gases, encompassing helium, neon, argon, krypton, xenon, and radon, reside in Group 18 of the periodic table. These gases are distinguished by their chemical inertness and exist as monoatomic entities at ambient temperature.
2. Boiling Points of Noble Gases: The boiling points of noble gases are characteristically low. For instance, helium exhibits one of the lowest boiling points of all elements, approximately \(4.2\,K\). This phenomenon is attributable to the weak attractive forces between their atoms, specifically Van der Waals dispersion forces, which are significantly less potent than the covalent or ionic bonds present in other substances.
3. Statement Analysis:
   • Statement I: This assertion posits that noble gases possess very high boiling points. This is erroneous, as noble gases in fact have low boiling points owing to weak intermolecular forces.
   • Statement II: This statement declares that noble gases are monoatomic and are bound by strong dispersion forces, resulting in elevated boiling points. Although the monoatomic nature of noble gases is correctly identified, the strength of the forces described is inaccurately represented. Dispersion forces are indeed present, but their inherent weakness leads to low boiling points for noble gases. Consequently, the conclusion of this statement is also false.
4. Conclusion: Both Statement I and Statement II are demonstrably false. Noble gases do not exhibit high boiling points due to the feebleness of their intermolecular forces.