5571. The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is
Dilute H₂SO₄
Oleum
Ultraviolet light
None of these
✅ The correct answer is option B.
Chemical Engineering
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5572. Sulphur removal by heating of pyrite ore in presence of air is called its
Reduction
Roasting
Calcination
Smelting
✅ The correct answer is option B.
5573. Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of
Calcium sulphate
Sodium chloride
Sodium sulphate
Magnesium chloride
✅ The correct answer is option B.
5574. Which of the following processes is absent in glass manufacturing process?
Sintering
Annealing
Shaping or forming
Melting
✅ The correct answer is option A.
5575. Which is the main reducing agent during production of iron from iron ore in a blast furnace?
C
CO
CO₂
H₂
✅ The correct answer is option B.
5576. Aryl benzene sulphonate (ABS) is a
Detergent
Plasticiser for unsaturated polyester
Starting material for the synthesis of glycerine
Coating ingredient for photographic film
✅ The correct answer is option A.
5577. Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of
Nitric acid
Hydrochloric acid
Methyl alcohol
Formic acid
✅ The correct answer is option A.
5578. Nickel is not used as a catalyst in the
Fischer-Tropsch process
Shift conversion
Hydrogenation of oil
Ostwald’s process of HNO₃ manufacture
✅ The correct answer is option D.
5579. Caprolactum (a raw material for nylon-6 manufacture) is produced from
Phenol
Naphthalene
Benzene
Pyridine
✅ The correct answer is option C.
5580. Paper grade bamboo contains about __________ percent cellulose.
5
20
40
60
✅ The correct answer is option A.