Description : Common salt is generally not produced commonly by __________ method from brine. (A) Freeze drying (B) Electrolytic (C) Solar evaporation (D) Vacuum evaporation
Last Answer : (A) Freeze drying
Description : Good quality of edible salt is obtained from brine by the process of (A) Solar evaporation (B) Vacuum evaporation (C) Freeze drying (D) Electrolysis
Last Answer : (B) Vacuum evaporation
Description : Mechanism of moisture removal in case of freeze drying of food stuff is by (A) Evaporation (B) Sublimation (C) Dehydration (D) Adsorption
Last Answer : (B) Sublimation
Description : In freeze- drying, water is removed from the product by a. Evaporation b. Sublimation c. Transpiration d. None of these
Last Answer : b. Sublimation
Description : The most common drying method is ____ drying. a. freeze- c. spray b. sun or tray drying d. oven
Last Answer : c. spray
Description : Common salt is obtained from sea water by the process of (a) sublimation (b) evaporation (c) crystallisation (d) filtration
Last Answer : Ans:(b)
Description : India has eight coastal states but more than half the sea salt is made along the Gujarat coast because (a) Gandhiji started the salt movement in Gujarat (b) Low rainfall and relative humidity are ideal ... ) Kandla port exports salt (d) The salinity of sea water is very high near the Gujarat coast
Last Answer : Ans: (b)
Description : One feels cold after a dip in sea water due to (a) convection currents (b) the deposition of salt on the body (c) the evaporation of water on the body (d) the difference in temperatures between land and sea
Last Answer : Ans:(c)
Description : Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent. (A) 10 (B) 25 (C) 50 (D) 98
Last Answer : (C) 50
Description : Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent. (A) 10 (B) 25 (C) 50 (D) 98
Last Answer : (A) 10
Description : Titanium is produced by __________ of Ti Cl4. (A) Electrolytic reduction (B) Calcium reduction (C) Magnesium reduction (D) Thermal dissociation
Last Answer : (C) Magnesium reduction
Description : In the constant rate period of the rate of drying curve for batch drying, (A) Cracks develop on the surface of the solid (B) Rate of drying decreases abruptly (C) Surface evaporation of unbound moisture occurs (D) None of these
Last Answer : (C) Surface evaporation of unbound moisture occurs
Description : Unit operation involved in the prilling of urea is (A) Evaporation (B) Drying (C) Crystallisation (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : During the constant rate period of drying of a solid, (A) Increased air humidity decreases the rate of drying (B) Increasing the air temperature decreases the drying rate (C) Surface evaporation of unbound moisture occurs (D) None of these
Description : The most important application of distribution law is in (A) Evaporation (B) Liquid extraction (C) Drying (D) Distillation
Last Answer : (B) Liquid extraction
Description : Water gets evaporated from water surfaces and land surfaces, get converted into water drops at lower temperatures, flows over ground surface and finally meets its source, i.e. lake, sea, etc. This ... Hydrological cycle (B) Water cycle (C) Evaporation and precipitation cycle (D) All the above
Last Answer : (D) All the above
Description : Pick out the wrong statement: (A) Reboiler is not used in open steam distillation (B) The separation of solutes of different molecular sizes in a liquid solution by use of a ... is used for calculating theoretical number of plates in a distillation column at normal operating reflux condition
Last Answer : (D) Fenske-Underwood equation is used for calculating theoretical number of plates in a distillation column at normal operating reflux condition
Description : Explain the following unit operations: (i) Mixing (ii) Drying (iii) Evaporation (iv) Absorption.
Last Answer : i)Mixing: Mixing is carried out for producing simple mixtures, accomplishing dispersions and promoting chemical reactions. It is a process in which two separate materials such as two different ... ammonia mixture by water 2) Removal of hydrogen sulfide from naturally occurring hydrocarbon gases.
Description : Phytometer method is generally used for the measurement of (A) Interception (B) Evaporation (C) Transpiration (D) None of these
Last Answer : Answer: Option C
Description : Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it (A) Has larger production capacity per unit cell (B) Consumes less power per ton of Cl2 produced (C) Produces high purity (70%) caustic soda directly (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction? (A) Oxidation of Na + ions (B) Oxidation of Cl - ions (C) Reduction of Na + ions (D) Reduction of Cl - ions
Last Answer : (B) Oxidation of Cl - ions
Description : Which of the following is bactericidal? A.Membrane filtration B.Ionizing radiation C.Freeze-drying D.Deep freezing
Last Answer : B.Ionizing radiation
Last Answer : onizing radiation
Description : In the process of freeze drying, a dense cell suspension is placed in small vials and is frozen at A- 60 to -78°C B- 20 to -30°C C- 30 to -48°C D- 48 to -58°C
Last Answer : - 60 to -78°C
Description : Explain The theory of freeze drying and state its application.
Last Answer : Theory:- i) In this process, the material is frozen in a suitable container connected to a high vacuum system, so that the vapour pressure of water vapours is ... antibiotics, blood products, vaccines, enzymes preparation, microbiological cultures & other thermo labile pharmaceutical substances.
Description : Explain principle of freeze drying. Give its advantages.
Last Answer : Principle: i. The material is frozen in a suitable container connected to a high vacuum system, so that the vapour pressure of water is reduced to less than that of material being dried. ii. ... it is properly sealed in an inert atmosphere. vii. The sterility of the product can be maintained.
Description : Give application of freeze drying.
Last Answer : (i) The process is mainly used for drying of biological products such as antibiotics, blood products, vaccines ,enzymes preparation, microbiological cultures etc. (ii) The heat sensitive material can be dried
Description : Discuss the theory, construction, and working of freeze drying apparatus
Last Answer : Theory: Freeze drying or sublimation drying consists of simply reducing the temperature & pressure to values below the triple point .(4.579mm of Hg& temp. of 0.0099 c) Under these ... . 5. Packing: Biological products are dried packed in aseptic condition immediately after drying.
Description : Discuss in brief Freeze drying.
Last Answer : Principle: The material is frozen in a suitable container connected to a high vacuum system, so that the vapour pressure of water is reduced to less than that of material being dried. Thus, it ... special precautions. 3. The period of drying is quite long.(usually not less than 10 hours)
Description : Mechanical recompression evaporation is used in the production of (A) Alcohol (B) Distilled water (C) Salt (D) Fruits jam
Last Answer : (B) Distilled water
Last Answer : Generally an electrolytic capacitor is made to provide large value of capacitance.
Description : Sand generally contains salt if it is obtained from: (A) Nala beds (B) River beds (C) Sea beds (D) None of these
Description : The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid (A) Its evaporation loss (B) Excessive corrosion (C) Uneconomic LMTD (D) Decrease in heat exchanger efficiency
Last Answer : (B) Excessive corrosion
Description : Salt content in sea water is about __________ percent. (A) 0.5 (B) 1 (C) 3.5 (D) 9.05
Last Answer : (C) 3.5
Description : Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C. (A) 25 (B) 60-70 (C) 150-200 (D) 250-300
Last Answer : (B) 60-70
Description : Multiple effect evaporation is generally recommended, when the (A) Large scale evaporation of liquor is needed (B) Corrosive liquids are to be concentrated
Last Answer : (A) Large scale evaporation of liquor is needed
Description : Vacuum is generally maintained in the vapour space of an evaporator mainly to (A) Get economical temperature difference by using moderate pressure steam (B) Facilitate forward ... (C) Concentrate heat sensitive materials (D) Achieve very high concentration of the final product
Last Answer : (A) Get economical temperature difference by using moderate pressure steam
Description : What are the methods of treatment & disposal of radioactive wastes? (A) Evaporation & chemical precipitation (B) Biological methods & adsorption in ion exchange materials (C) Fixing into a solid mass with cement and sinking deep in the sea (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Does sea salt taste the same no matter where it was produced?
Last Answer : I wouldn’t think so. Different oceans have different minerals.
Description : (4) Decomposition of manganese dioxide Explanation: One of the two chemical methods starts from natural manganese dioxide and converts it using dinitrogen tetroxide and water to manganese nitrate ... 400°C, the salt decomposes, releasing N2O4 and leaving a residue of purified manganese dioxide.
Last Answer : The mass number of a nucleus is - (1) always less than its atomic number (2) the sum of the number of protons and neutrons present in the nucleus (3) always more than the atomic weight (4) a fraction
Description : The remains of salt over the soil after evaporation of water is known as a. water logging b. salivation c. dehydration d. hydration
Last Answer : d. hydration
Description : Advantage of continuous drying over batch drying is that the (A) Drying cost per unit weight of dried product is less (B) Product with more uniform moisture content is produced (C) Equipment size required is smaller (D) All 'a', 'b' & 'c'
Last Answer : (D) All 'a', 'b' & 'c'
Description : Consider the diurnal (daily) cycle of temperature at the surface. Why is the tem- perature maximum in the mid-to-late afternoon? (a) There is a net energy gain at the surface from dawn to mid- ... this time. (d) Late in the day, evaporation from the surface increases and this cools the surface.
Last Answer : There is a net energy gain at the surface from dawn to mid- afternoon.
Description : Which metal is extracted by electrolytic reaction method? -Do You Know?
Last Answer : answer:
Description : Which of the following can be purified by the electrolytic method? (a) Sodium (Na) (b) Copper (Cu) (c) Boron (B) (d) Chlorine (C12)
Last Answer : Ans:129
Description : Which metal is extracted by electrolytic reaction method?
Last Answer : Al (Aluminium)
Description : Sea water can be purified by the process of – (1) distillation (2) evaporation (3) filtration (4) fractional distillation
Last Answer : (1) distillation Explanation: The traditional process used in desalination operations is vacuum distillation- essentially the boiling of water at less than atmospheric pressure and thus a much ... when the vapor pressure equals the ambient pressure and vapor pressure increases with temperature.
Description : Tamilnadu coastal belt has drinking water shortage due to: (A) high evaporation (B) sea water flooding due to tsunami (C) over exploitation of ground water by tube wells (D) seepage of sea water
Last Answer : Answer: D With increasing exploitation of ground water, seepage of seawater into the earth takes place, reducing sea water level. Coastal environment plays a vital role in nation's economy by virtue ... coastal length of India and stretches along the Bay of Bengal, Indian Ocean and Arabian Sea.