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

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 gas is more easily liquified among following?

A supercritical fluid is formed whenever

With reference to 'Ozone layer', which of the following statements is/are correct? 1. Ozone layer shields the surface of the earth from the ultra-violet radiations from the Sun. 2. Ozone depletion ha…