In the earth's atmosphere ,light gases like hydrogen, helium, etc., are scarce- explain why.

If a gas jar filled with a light gas like hydrogen is held upside down on another gas jar filled with carbon dioxide,it is observed that the two gases produce a homogenous mixture in the jars. What is the name of this process?

After entering the earth's atmosphere, a meteorite burns completely. Explain why.

An empty balloon (or a soft plastic bag) weighs the same as what it does when filled with air at atmospheric pressure-explain why.

The primitive atmosphere of earth contained water vapours, hydrogen, ammonia and

Four tyres of a motor car were filled with nitrogen, hydrogen, helium and air. In which order are these tyres to be filled with the respective gases again?

In Rutherford' experiment, generaly the thin foil of heavy atoms, like gold, paltinum etc. have been used to e bombarded by the alpha -particles. If the thin foil of light atoms like aluminium etc. is used, what difference would be observed from the above results?

Explain why the metals placed above hydrogen in the electrochemical series are not available in nature in the free state.