Which of the following processes is absent in glass manufacturing process ?
(A) Sintering
(B) Annealing
(C) Shaping or forming
(D) Melting
Pick out the wrong statement ?
(A) Cold rubber (SBR) is superior as compared to hot rubber (SBR)
(B) Polymerisation temperature can modify the properties of SBR
(C) Production of cold SBR employs lower pressure as compared to that of hot SBR
(D) None of these
Bleaching of paper pulp is done with__________________?
(A) Activated clay
(B) Bromine
(C) Chlorine or chlorine dioxide
(D) Magnesium sulphite
Concentration of sulphide ores is done usually by____________________?
(A) Roasting
(B) Smelting
(C) Froth floatation
(D) Electromagnetic separation
Diaphragm electrolytic cell as compared to mercury electrolytic cell_____________________?
(A) Produces 70% NaOH solution
(B) Requires less specific power consumption for the production of chlorine
(C) Requires lesser investment for similar capacity
(D) All A ,
Pick out the wrong statement ?
(A) Strongly caking coal should not be used in the Lurgi gasifier
(B) Acetylene gas cannot be used for illumination purpose
(C) Water gas is called blue gas because of the color of the flame, when it is burnt
(D) Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels
In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by ?
(A) Increasing the oxygen concentration
(B) Putting more quantity of V2O5 catalyst in the converter
(C) Removing some quantity of SO3 during intermediate stage
(D) Maintaining low temperature & pressure in the converter
Which of the following is a detergent ?
(A) Benzene hexachloride
(B) Alkyl benzene sulphonate
(C) Polytetrafluoroethylene
(D) Cellulose nitrate
Dense soda ash used in the manufacture of glass, is chemically represented by__________________?
(A) Na2CO3
(B) Na2CO3.10H2O
(C) Na2CO3.H2O
(D) Na2HCO3