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Vulcanization: Vulcanization is very widely used in rubber technology to improve the properties such as low tensile strength, plastic nature, thickness etc. by adding some chemicals like sulphur, hydrogen sulphide, benzene chloride etc. it is done by heating of raw rubber with sulphur at 100: 140 degree centigrade temperature. The added sulphur combines chemically as the double bonds of different rubber springs. Sulphur can also bring about vulcanization without affecting the double bonds in the polymer molecule, by eliminating H2S. The rate of vulcanization of rubber is quite slow and also depends upon the types and quality of rubber used. But, by using certain organic compounds called accelerators, vulcanization reaction speed up.
A red flame is produced when LiCl is heated. How can I determine which transition between the energy levels produces this colour?
reactivity of f-block elements
Explain meso stereoisomer a) For a molecule to have a meso stereoisomer, it must have more than single asymmetric atom, and it must be divisible into constitutionally identical
all alkalis are bases but all bases are not alkalies?
How many unpaired electrons are present in Ni 2+ cation (atomic number = 28): (1) 0 (2) 2 (3) 4 (4) 6 Ans: 2
Q. Show the Structure of sulphuric acid? Theoretical considerations require that the reaction be carried out at low temperature and high pressure. However, at low temperature,
While solving lime sida numericals we calculate CACO3 equivalent .In this we do conc. In ppm×100/mol. Wt. ssomewhere we multiply 2 × m. Wt .so wht 2
Calculate the molarmass of a nonelectrolyte that lowers the freezing point of 25.00g of water to -3.9 degrees C when 4.27 g of the substance is dissolved in the water.
the increasing order(lower first) for the values of e/m (charge/mass) for e,p,n,a?
Why rate of reaction in zero order is independent of concentration? Solution) Where r is the reaction rate and k is the reaction rate coefficient with units of time / concentrat
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