Question

What were the reasons for late discovery of noble gases?

• A. Chemical inertness of lighter noble gases, $i.e$., He, Ne and Ar.
• B. rare abundance of comparatively reactive noble gases, $i.e$., Kr, Xe and Rn.
• C. They were not found in the nature very early, so could not be found.
• D. None of the above.

Answer 1

Answer: (A), (B)

The correct options are
A Chemical inertness of lighter noble gases, $i.e$., He, Ne and Ar.
B rare abundance of comparatively reactive noble gases, $i.e$., Kr, Xe and Rn.

The reasons for late discovery of noble gases:

Chemical inertness of lighter noble gases, i.e., He, Ne and Ar,

Rare abundance of comparatively reactive noble gases, i.e., Kr, Xe and Rn

Hence options A & B are correct