Plasticisers are added to synthetic plastics to____________________?
(A) Impart flexibility
(B) Improve workability during fabrication
(C) Develop new improved properties not present in the original resins
(D) All A,
One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to_________________?
(A) Adjust the pH of the syrup
(B) Remove the coloring matter from the syrup
(C) Reduce the viscosity of the syrup
(D) Improve the rate of crystallisation of sugar
Which of the following impurities in feed water for high pressure boiler is the most detrimental ?
(A) Silica
(B) Dissolved oxygen
(C) Suspended salt
(D) Dissolved salt
Which of the following processes can remove both temporary as well as permanent hardness of water ?
(A) Filtration
(B) Boiling
(C) Distillation
(D) None of these
Phenol formaldehyde is produced by condensation polymerisation. It is also known as_____________________?
(A) Teflon
(B) Bakelite
(C) Polyester
(D) Nylon-66
What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell ?
(A) Cl2 & Na
(B) Cl2 & H2
(C) O2 & H2
(D) Cl2, H2 & NaOH solution
Contact process of sulphuric acid manufacture ____________________?
(A) Yields acid of higher concentration than chamber process
(B) Yields acids of lower concentration than chamber process
(C) Is obsolete
(D) Eliminates absorber
Favourable conditions for the liquefaction of gases in general are _____________________?
(A) High pressure & low temperature
(B) Low pressure & high temperature
(C) High pressure & high temperature
(D) Low pressure & low temperature
Catalytic oxidation of toluene produces____________________?
(A) Styrene
(B) Phenol
(C) Benzene
(D) Tri-nitro-toluene