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Bakelite:
It is thermosetting plastics which are most widely used and the most important plastics.
Preparation:
It is formed by condensation reaction of phenol and formaldehyde.
Properties:
1. It possesses outstanding electrical and mechanical properties.
2. It is resistant to heat, water and many chemicals.
3. It decomposes by concentrated caustic alkalis, sulphuric acid and nitric acid.
Uses:
1. Uses for making switch boards, aircraft accessories, automobile and telephone.
2. Asbestos is added to increase resistance to heat and chemicals. Moulded sheets having many uses are made by impregnating paper sheets in resins.
Q. Illustrate Crystal Field Theory with s-orbitals? Let us start with s-orbitals which are spherically symmetrical. Any effect due to mutual repulsions between the s-electrons
a. 'Hormones are chemical messengers.' Explain? b. Name the main disease caused due to lack of the vitamin and its source in each of the following: A, B 6 and E.
WHAT IS THE PRINCIPLE OF EDTA TITRATION N?
How to syhtsize nanoparticles for nanomedicine
The Fermi level is The highest occupied energy level at 0 0 K.
how intigration of 3rd order reaction done by partial fraction method
The hydride ions H- are isoelectronic with: (1) Li (2) He + (3) He (4) Be Ans: He
h2c2o4 + mno-4 - mno-4 +co2
Derive Nerst equation for both anode and cathode.
The molecule having one unpaired electron is: (1) NO (2) CO (3) CN - (4) Fe Ans: NO
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