Chemical Engineering Objective Questions { Chemical Process }

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505. Highly porous refractory bricks are

A. Less susceptible to chemical attack by molten fluxes and gases etc

C. Having very high thermal conductivity

D. None of these

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506. Fumigant insecticides

A. Kill insects, when they eat it

B. Emit poisonous vapour

C. Are absorbed throughout the plant

D. None of these

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507. Function of sodium thiosulphate (hypo) in development of photographic film/plate is to

A. Brighten the faint images

B. Remove metallic silver

C. Convert silver chloride to silver

D. Remove unexposed silver halide

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508. In contact process, SO₃ is absorbed in 97% H₂SO₄ and not in water, because

A. SO₃ gas is sparingly soluble in water

B. Water forms an acid mist, which is difficult to absorb

C. The purity of acid is affected

D. Scale formation in the absorber is to be avoided

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509. DDT stands for

A. Diethyl-diphenyl-trichloromethane

B. Dichloro-diphenyl-trichloromethane

C. Diphenyl-dichloro-trichloromethane

D. Dichloro-diphenyl-trichloroethane

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510. Process conditions in fermentator used for production of penicillin is

A. 25°C, 2 atm

B. 50°C, 10 atm

C. 30°C, 200 mm Hg (absolute)

D. 90°C, 45 atm

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511. Nitric acid is not used in the manufacture of

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