5381. Phosphate rock is a raw material for the manufacture of
Phosphoric acid
Phosphorous
Superphosphates
All of the above
✅ The correct answer is option D.
Chemical Engineering
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5382. Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
Nickel
Vanadium
Alumina
Iron
✅ The correct answer is option B.
5383. Neon gas is
Flammable in nature
Used in color discharge tube
Filled in lamps having tungsten filament
All of the above
✅ The correct answer is option B.
5384. Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like
High cost
Fragile nature
Easy poisoning tendency
All of the above
✅ The correct answer is option D.
5385. Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
L.D. converter
Blast furnace
Rotary kiln
Recuperator
✅ The correct answer is option D.
5386. Main use of liquid nitrogen is in
Rocket propulsion
Making gun powder
Detergent manufacture
Refrigerative cooling
✅ The correct answer is option D.
5387. The drug used in contraceptives is
Sulphadizene
Mestranol
Methyl salicylate
Pencillin
✅ The correct answer is option B.
5388. Use of chlorine in the treatment of sewage
Helps in grease separation
Increases the biological oxygen demand(BOD)
Causes bulking of activated sludge
Aids in flocculation
✅ The correct answer is option A.
5389. In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed :
Furnace → converter → absorber
Furnace → evaporator → absorber
Furnace → converter → evaporator
Converter → furnace → absorber
✅ The correct answer is option A.
5390. Wax is a
Mixture of glycerides
Mixture of esters of polyhydric alcohols excepting glycerine
Liquid at room temperature
Mixture of glycerides of fatty acids
✅ The correct answer is option B.