Question

What is the boiling point of Helium?

(a) 7.8 K

(b) 0 K

(c) 4.2 K

(d) 3.7 K

The question was asked in examination.

Question is from P-Block in division P-Block Elements of Chemistry – Class 12

Answer 1

The correct answer is (c) 4.2 K

Best explanation: The melting and boiling points of noble gases are very low. This is because the atoms are held together by very weak Van der Waals forces of attraction in both liquid and solid states. Helium has the lowest boiling point, equal to 4.2 K, among all known substances.