CBSE Class 9 Answered

The fourth state of matter is Plasma. Plasma is the most abundant state of matter in the universe. A majority of the stuff in space is Plasma. It is also plays an important part in safe, unlimited and renewable energy. Plasmas are very hot, and they vaporize anything they touch.

The fifth state of matter is BEC (Bose-Einstein Condensate). A Bose–Einstein condensate is a state of matter formed by bosons cooled to temperatures very near to absolute zero (0 kelvin or -273.15°C). Under such supercooled conditions, a large fraction of the atoms collapse into the lowest quantum state, at which point quantum effects become apparent on a macroscopic scale.