Which gas is more easily liquified among following?

Which one of the following gas smells like a rotten egg?

Which of the following represent the suitable condition for the liquefaction of gases?

Which of the following gasses is/are lighter than air? 1. Hydrogen chloride 2. Sulfur dioxide 3. Helium

A supercritical fluid is formed whenever

Indian Astronaut visited the International space station in 2025 under which mission?