Extraction of coffee from its seed is done by (A) Liquid-liquid extraction (B) Leaching (C) Extractive distillation (D) Steam distillation

Extraction of coffee from its seed is done by

(A) Liquid-liquid extraction

(B) Leaching

(C) Extractive distillation

(D) Steam distillation


by

1 Answer

Answer :

(B) Leaching

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Black liquor is converted into white liquor by (A) Evaporation and burning the concentrate followed by causticisation of products (B) Multi-effect evaporation only (C) Selective liquid extraction (D) Extractive distillation

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Rose oil is extracted from rose leaves using __________ distillation. (A) High pressure (B) Low pressure (C) Extractive (D) Steam

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Alcohol is dehydrated using __________ distillation. (A) Extractive (B) Azeotropic (C) Steam (D) Molecular

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Langmuir equation is associated with (A) Leaching (B) Adsorption (C) Steam distillation (D) Multi-component absorption

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In extractive distillation, solvent is (A) Added to alter the relative volatility of the mixture (B) Of high volatility (C) Present in overhead stream (D) Of high viscosity to give high tray efficiency

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In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated. (A) Molecular (B) Azeotropic (C) Extractive

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Pick out the correct statement. (A) Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of non￾ideal binary system by distillation (B) A sharp decrease in pressure drop is an indication of flooding in a distillation coloumn (C) Solvent used in extractive distillation should be of high volatility (D) Flash distillation is suitable for separating components which have very close boiling temperature

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Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation? (A) Cost (B) Availability(C) Toxicity(D) Selectivity

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Duhring's plot' is of use in (A) Extractive distillation (B) Evaporation

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Pick out the wrong statement. (A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given ‘L/V’ ratio (B) The extraction per unit of total height for a short packed column is more effective than for a tall column, in case of liquid-liquid extraction(C) Natural draft cooling towers are made of ferroconcrete and its cross￾section is wider at the bottom(D) Vander wall adsorption is also called chemisorption

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Which of the following unit operations makes use of Thiele-Geddes equation? (A) Liquid-liquid extraction (B) Solid-liquid extraction (C) Multi-component absorption with chemical reaction (D) Multi-component distillation

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Heat sensitive materials with very high latent heat of vaporisation may be economically separated using (A) Liquid extraction (B) Distillation (C) Evaporation (D) Absorption

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Leaching of coffee from coffee beans is done by (A) Hot water (B) Hexane (C) Lime water (D) Dilute H2SO4 (hot)

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Ion exchange process is similar to (A) Absorption (B) Adsorption (C) Extraction (D) Leaching

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Bollman extractor (A) Is a static bed leaching equipment (B) Is used for extraction of oil from oilseed (C) Is a centrifugal extractor (D) Employs only counter-current extraction

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Degree of freedom for leaching and solvent extraction process is (A) 0 (B) 1 (C) 2 (D) 3

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With increase in temperature, the rate of extraction in leaching (solid￾liquid extraction system). (A) Increases (B) Decreases (C) Remain unaffected (D) Increases Linearly

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For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates. (A) Binary mixture is represented by the apex (B) Binary mixture is represented by any point inside (C) Ternary mixture is represented by the sides (D) Pure component is represented by the apex

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Which of the following solvents is used for the extraction of H3PO4 from CaCl2 solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching? (A) Isopropyl alcohol (B) Butyl alcohol (C) Toluene (D) Hexane

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Extraction of gold and silver involves leaching the metal with `CN^(-)` ion. The metal is recovered by _______

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Leaching can be used for the extraction of which metals (i) Pb (ii) Al (iii) Ag (iv) Au

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Coffee is prepared from coffee beans by leaching with (A) Cold water (B) Hot water (C) Dilute hot caustic solution (D) Naphtha

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