The gas which turns into liquid at the lowest temperature among the following is A. Hydrogen B. Oxygen C. Helium D. Nitrogen

The correct answer is helium.

Helium has the lowest boiling point of any element at standard pressure

(-269.4°C or -452.3°F). This is because helium atoms have very weak intermolecular forces. The atoms are so small that they can easily slip past each other, which makes it difficult for them to form a liquid.

Hydrogen has a boiling point of -252.87°C or -423.17°F. Oxygen has a boiling point of -182.96°C or -297.33°F. Nitrogen has a boiling point of -195.8°C or -320.4°F.

All of these gases are colorless, odorless, and tasteless. They are also all very light, which is why they are often used in balloons and airships.