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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.
Which of the following set of quantum number is not valid: (1) n=1, l=2 (2) 3=2, m=1 (3) m=3,l=0 (4) 3=4,l=2
what are the chemical poperties of p-block elements ?
The emf of the cell Cd/CdSO4(0.0093M)//CdSO4/Cd is 0.086V at 25°C find the value of X solution
The mole (calculation using the mole formula should be included).
Nitrite rubbers (Gr-A or Buna-N or NBR): Nitrite rubber is prepared by the copolymerization of butadiene and acrylonitrile in emulsion systems. Properties: 1.
A monosaccharide A has a molecular weight of 150 Da. The two stereoisomers B and C that are both optically inactive form when A reacts with NaBH4. Verify at all stereocenters i
Imidazole Imidazole has one nitrogen that has the electronic character of the nitrogen in pyrrole, and one that is like the nitrogen in pyridine, except that it is somewhat m
HYDROGEN Hydrogen is the natural element in the Universe and is a major constituent of stars. It is relatively much less common on Earth but nevertheless forms nearly 1% by mass
what are the principle underlying the extraction of metals
why pcl3 is less polar than sicl4
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