Q. Pick up the correct statement from the following: (Solved)
1. Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite
2. Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite
3. Pollark, an Austrian scientist prepared a substance from urea and formaldehyde and called it Plastic
4. All the above
- d. All the above