Multiple Choice QuestionsThe example of thermosetting and thermoplastic polymer respectively is
polystyrene, polyvinylchloride
bakelite, polystyrene
polyethene, polyacredonitrile
polystyrene, urea-formaldehyde resin
Which of the following is the weakest Lewis Base?
OH-
H-
HCO3-
Cl-
B.
H-
A Lewis acid-base reaction occurs when a base donates a pair of electrons to an acid. A Lewis acid-base adduct, a compound that contains a coordinate covalent bond between the Lewis acid and the Lewis base, is formed. The following equations illustrate the general application of the Lewis concept.
The boron atom in boron trifluoride, BF3, has only six electrons in its valence shell. Being short of the preferred octet, BF3 is a very good Lewis acid and reacts with many Lewis bases; a fluoride ion is the Lewis base in this reaction, donating one of its lone pairs:
The cooking gas is mainly a mixture of the following two gases
methane and ethane
ethane and propane
propane and butane
butane and pentane
Producer gas is
Mixture of CO and H2
Mixture of CO2 and H2
Mixture of CO2 and Cl2
Mixture of CO and N2
What is the color of the precipitate which is formed when aqueous solutions of sodium sulphate and barium chloride are mixed?
Yellow
White
Green
Orange
Which is not obtained by the destructive distillation of coal?
Coal gas
Petroleum
Ammonia Liquor
Coal tar
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