Tetraethyl lead is used as___?

Which allotrope of carbon is in rigid three dimensional structure to?

Sodium metal is kept under?

_____ discovered inert gases.

A mixture of water and alcohol can be separated by?

Who was the inventor of electron microscope?

The region covered by water is known as

One fathom is equal to

Joule is the unit of

Why is gravity so weired?

The weight of an object is due to ___?