Dichloro diphenyl ________________ is the full form of DDT (an insecticide) ?
(A) Tetrachloroethane
(B) Trichloroethane
(C) Tetrachloromethane
(D) Trichloromethane
Calcareous & argillaceous materials are used in the manufacture of ___________________?
(A) Lead
(B) Cement
(C) Carbon disulphide
(D) None of these
Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of __________________?
(A) 4 kgf/cm2 & 500°C
(B) 10 kgf/cm2 & 1000°C
(C) 40 kg/cm2 & 200°C
(D) 100 kgf/cm2 & 500°C
Fats as compared to oils have ___________________?
(A) More unsaturated glycerides of fatty acids
(B) Less unsaturated glycerides of fatty acids
(C) Much higher reactivity to oxygen
(D) Lower melting point
Oils are partially hydrogenated (not fully) to manufacture Vanaspati , because fully saturated solidified oils ?
(A) Cause cholesterol build up and blood clotting
(B) Are prone to rancid oxidation
(C) Always contain some amount of nickel (as their complete removal is very difficult)
(D) Have affinity to retain harmful sulphur compounds
Catalytic oxidation of naphthalene produces ?
(A) Styrene
(B) Phenol
(C) Phthalic anhydride
(D) None of these
The temperature in the calcium carbide furnace is _______________ °C ?
(A) 200-300
(B) 700-850
(C) 2000-2200
(D) 4000-4500
Highly porous refractory bricks are ____________________?
(A) Less susceptible to chemical attack by molten fluxes and gases etc
(B) Very strong
(C) Having very high thermal conductivity
(D) None of these
Low purity oxygen is used for____________________?
(A) L.D. steel making
(B) Cutting and welding of metals
(C) Medicinal purposes
(D) Chemical oxidation processes
Anion exchanger is regenerated usually with ____________________?
(A) NaOH
(B) H2SO4
(C) Hydrazine
(D) Alum solution