" Among the following cryogenic liquids, which liquefied gas has an extremely low boiling point?

Correct option is D

Liquid Helium has the lowest boiling point among the given options. It boils at an extremely low temperature of approximately −269°C (4.2 K), making it the coldest of all known cryogenic liquids. Liquid helium is widely used in cryogenics, particularly in the cooling of superconducting magnets due to its extremely low boiling point​​.
Information Booster:
Liquid Helium (Boiling point: −269°C or 4.2 K): Liquid helium is the coldest cryogenic liquid used in scientific applications, especially in cryogenics and cooling superconducting magnets in MRI machines and particle accelerators. Its extremely low boiling point makes it ideal for applications requiring ultra-cold temperatures​​.
Additional Knowledge:
Liquid Nitrogen (Boiling point: −196°C or 77 K): Liquid nitrogen is commonly used in cryogenic preservation and scientific experiments due to its relatively low boiling point. It is often utilized to freeze biological samples and in cryosurgery​.
Freon (Boiling point: −29°C to −40°C depending on the type): Freon is used as a refrigerant and does not have a very low boiling point compared to other cryogenic liquids​.
Liquid Carbon Dioxide (Boiling point: −78.5°C or 194.65 K): Liquid carbon dioxide, while cold, has a much higher boiling point than both liquid nitrogen and liquid helium, making it unsuitable for cryogenic applications where ultra-low temperatures are required​​.