Urea is constituted by:
Urea is prepared commercially in vast amounts fromliquid ammonia and liquid carbon dioxide
The nucleus of an atom consists of-
Milk tastes sour when kept in the open for sometimes due to the formation of-
The element used for making solar cells is
The acid used in lead storage cells is-
Which metal is extracted from seawater?
The noble gas used in radiotherapy is
The important ore of aluminium is-
The fuel that is used in modern submarines is -
A polymeric substance used to make parachute is
Which of the following is a physical change?
