Agglomeration of individual particles into clusters (flocs) is called
flocculation. To prevent flocculation, the most commonly used dispersing
agents are
(A) Carbonates
(B) Sulphates
(C) Silicates & phosphates
(D) Bi-carbonates

1 Answer

Answer :

(C) Silicates & phosphates

Related questions

Description : __________ are used as corrosion inhibitor for iron & steel in aqueous solutions. (A) Phosphates (B) Chromates (C) Sulphates (D) Bi-carbonates

Last Answer : (B) Chromates

Description : Magnesium and calcium __________ cause temporary hardness of water. (A) Carbonates (B) Bicarbonates (C) Phosphates (D) Sulphates

Last Answer : (B) Bicarbonates

Description : Permanent hardness of water is due to the presence of calcium & magnesium (A) Bi-carbonates (B) Sulphates & chlorides (C) Carbonate (D) None of these

Last Answer : (B) Sulphates & chlorides

Description : Injurious effects of sulphates can be replaced with the addition of ________: a. Nitrates b. Phosphates c. Ammonia d. Ca & Mg

Last Answer : Nitrates

Description : Main constituents of Portland cement are calcium aluminate and (A) Gypsum (B) Silicates (C) Sodium silicate (D) Carbonates

Last Answer : (B) Silicates

Description : The impurity of mixing water which affects the setting time and strength of concrete, is (A) Sodium sulphates (B) Sodium chlorides (C) Sodium carbonates and bicarbonates (D) Calcium bicarbonates

Last Answer : Answer: Option C

Description : The commonest form of iron & manganese found in ground water as pollutant is in the form of their (A) Carbonates (B) Bi-carbonates (C) Chlorides (D) Sulphides

Last Answer : (B) Bi-carbonates

Description : Presence of dissolved impurities of __________ is responsible for the red brownish color of water. (A) Carbonates (B) Bi-carbonates (C) Iron & manganese (D) Arsenic

Last Answer : (C) Iron & manganese

Description : Certain carbonates and phosphates are removed by

Last Answer : Certain carbonates and phosphates are removed by A. Skin B. Liver C. Kidneys D. None of the above

Description : $ Minerals such as carbonates and phosphates acts as buffers. ! Biomolecules contain only 25 elements out of the 109 known elements.

Last Answer : $ Minerals such as carbonates and phosphates acts as buffers. ! Biomolecules contain only 25 elements out of ... wrong D. If both As and R are wrong.

Description : Diamond is chemically (a) a mixture of metal carbonates (b) pure carbon (c) a pure form of sand (d) a mixture of calcium and magnesium phosphates

Last Answer : Ans:(b)

Description : Which of the following is not accomplished by agitation of liquids in agitators? (A) Dispersing gas in liquid (B) Blending of immiscible liquids (C) Dispersing immiscible liquid in form of emulsion (D) Suspending solid particles

Last Answer : (B) Blending of immiscible liquids

Description : A catalyst loses its activity due to (A) Loss in surface area of the active component (B) Agglomeration of metal particles caused by thermal sintering of the solid surface (C) Covering of the catalytic active sites by a foreign substance (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : Additives used for promoting the flocculation of particles is a/an (A) Electrolyte (B) Surface active agent (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Description : For benefication of iron ore, the most commonly used method is (A) Flocculation (B) Froth floatation (C) Jigging & tabling (D) None of these

Last Answer : (C) Jigging & tabling

Description : Phosphates (e.g., tricresyl, tributyl, tetrabutyl, triphenyl etc.) are addedto polymers to act as (A) Hardeners (B) Anti-shrinkage agents (C) Plasticisers (D) Transparency improver

Last Answer : (C) Plasticisers

Description : According to IS : 2720 - 1965, the composition of a dispersing solution used in pipette analysis for determining the size of particles, is (A) sodium-hexametaphosphate 33 g, sodium carbonate 7 g ... -hexametaphosphate 23 g, sodium carbonate 17 g and distilled water one litre (D) None of these

Last Answer : Answer: Option A

Description : Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a __________ operation. (A) Clarification (B) Sedimentation (C) Flocculation (D) Classification

Last Answer : (D) Classification

Description : Consider the following statements : Activated sludge process can be said to comprise : 1. Conversion of dissolved organic matter into biological flocs 2. Removal of dissolved BOD of the waste water 3. Digestion of the sludge Which ... 2 and 3 (b) 1 and 2 only (c) 2 and 3 only (d) 1 and 3 only

Last Answer : (b) 1 and 2 only

Description : What are the major constituents of typical fly ash particles generated from the combustion of coal? w) acidic and basic oxides x) trace elements y) unburned carbon z) sulfates and phosphates

Last Answer : ANSWER: W -- ACIDIC AND BASIC OXIDES 

Description : Which one of the following is the most possible solution for planning improvement of a metropolitan city in India? [IAS 2003] (a) Constructing high rise building and sky scrapers (b) ... and satellite towns around the main city (d) Preventing immigration of people into the metropolitan city

Last Answer : Ans: (b)

Description : The alpha particles are compact clusters of-------? A. Electron and Proton B. Two Protons and two Neutrons (Answer) C. Three protons and three Neutrons D. None

Last Answer : B. Two Protons and two Neutrons (Answer)

Description : Lime and soda ash are added to water to remove (A) Bicarbonates & sulphates of calcium and magnesium (B) Undesirable taste and odour (C) Bacteria (D) Its corrosiveness

Last Answer : (A) Bicarbonates & sulphates of calcium and magnesium

Description : The process of heating the cold pressed metallic powder is called __________ in powder metallurgy. (A) Precipitation (B) Fusion (C) Sintering (D) Agglomeration

Last Answer : (C) Sintering

Description : Which of the following is not categorised as the ore agglomeration process? (A) Nodulising (B) Pelletising (C) Balling (D) Briquetting

Last Answer : Option C

Description : If a force greater than that of gravity is used to separate solids & fluidsof different densities, the process is termed as the (A) Sedimentation (B) Flocculation (C) Dispersion (D) Centrifugation

Last Answer : (D) Centrifugation

Description : What is A device that absorbs and draws heat from a hot object dispersing it into the surroundings is which one of the following?

Last Answer : Need answer

Description : The number of `alpha`-and `beta`-particles emitted in the nuclear reaction, `._(90)Th^(228) to ._(83)Bi^(212)`, respectively are

Last Answer : The number of `alpha`-and `beta`-particles emitted in the nuclear reaction, `._(90)Th^(228) to ._(83)Bi^( ... ` and `1 beta` D. `4 alpha` and `7 beta`

Description : The number of `alpha` and `beta`-particles emitted in the nuclear reaction `._(90)^(210) Th to ._(83)^(212)Bi` are:

Last Answer : The number of `alpha` and `beta`-particles emitted in the nuclear reaction `._(90)^(210) Th to ._(83)^(212 ... `3 alpha, 7 beta` D. `4 alpha, 1 beta`

Description : Consider the following statements: 1. Carbonate hardness is due to bicarbonates. 2. Non-carbonate hardness is due to sulphates and chlorides of Ca and Mg. 3. Both the hardnesses can be removed by lime-soda method. 4. Both the hardnesses can be ... (b) 1, 2 & 4 only (c) 2, 3 & 4 only (d) 1, 2, 3 & 4

Last Answer : (a) 1, 2 & 3 only

Description : In hydrometer analysis for a soil mass (A) Both meniscus correction and dispersing agent correction are additive (B) Both meniscus correction and dispersing agent correction are subtractive ... is subtractive (D) Meniscus correction is subtractive and dispersing agent correction is additive

Last Answer : (C) Meniscus correction is additive and dispersing agent correction is subtractive

Description : Hydrometer readings are corrected for: (A) Temperature correction (B) Meniscus correction (C) Dispersing agent correction (D) Temperature, meniscus and dispersing agent corrections

Last Answer : Answer: Option D

Description : Large scale African slavery began as a means of: (a) Dispersing the captives of African warfare (b) Dispersing populations from overcrowded areas (c) Supplying labour for New World plantations (d) All of these (e) None of these

Last Answer : c) Supplying labour for New World plantations

Description : Separation of materials into products based on the difference of theirsizes is called (A) Sizing (B) Sorting (C) Classification (D) Flocculation

Last Answer : (A) Sizing

Description : Molecular sieves are porous (A) Alumina (B) Silica (C) Synthetic zeolites crystals/metal alumino-silicates (D) None of these

Last Answer : (C) Synthetic zeolites crystals/metal alumino-silicates

Description : Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material? (A) Slag cement (B) Glasses (C) Porcelain/Potteries (D) Teflon

Last Answer : (D) Teflon

Description : Define Agglomeration Economies -SST 10th

Last Answer : a localized economy in which a large number of companies, services, and industries exist in close proximity to one another and benefit from the cost reductions and gains in efficiency that result from this proximity

Description : What are ‘agglomeration economies’? -SST 10th

Last Answer : Cities provide markets and also provide services such as banking, insurance, transport, labour, consultants and financial advisors, etc., to the industries. Many industries tend to come ... is basically coordination of various industries in a city for the development of manufacturing industries.

Description : What do you mean by agglomeration economics? -SST 10th

Last Answer : Cities provide markets and also provide services such as banking insurance,transport, etc. to the industry. Many industries tend to come together to make use of the advantages offered by the urban centers known as agglomeration economics.

Description : What is agglomeration and what are its advantages and disadvantages?

Last Answer : Need answer

Description : What is the process that tends to build up the land surface by deposition of solid material in its lower areas, known as? a. Abrasion b. Agglomeration c. Aggradation d. Attrition

Last Answer : c. Aggradation

Description : Explain the stability of carbonates & bicarbonates of alkali metals . 

Last Answer : The alkali metals form salts with all the oxo-acids. They are generally soluble in water and thermally stable. Their carbonates (M2CO3) and in most cases the hydrogencarbonates (MHCO3) also are highly ... the formation of more stable Li2O and CO2. Its hydrogencarbonate does not exist as a solid.  

Description : Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the (A) Coagulation (B) Flocculation (C) Sedimentation (D) Clarification

Last Answer : (C) Sedimentation

Description : Pick up the correct statement from the following: (A) The free quartz suddenly expands at a temperature lower than 600°C (B) The lime stone resists fire upto about 800°C and at higher temperature it splits into ... (C) The sand stone with silicates resist a fire in a better way (D) All the above

Last Answer : Answer: Option D

Description : I have tree what is it called?It has lge heart shaped leaves & clusters of sm white flowers, it now has long green pods

Last Answer : This tree is a Catalpa tree. Sometimes the long green pods become wormy. Otherwise it is a lovely tree and good for shade.

Description : Separation of materials of the same density based on their sizes by using then-different rates of flow is called (A) Sorting (B) Sizing (C) Flocculation (D) Elutriation

Last Answer : (B) Sizing

Description : Winds are classed as agents of erosion rather than of weathering because: w) they have nothing to do with the weather x) they carry rock particles away y) they work only part of the time z) they build up rather than wear down the rock

Last Answer : ANSWER: X -- THEY CARRY ROCK PARTICLES AWAY

Description : Which of the following statements regarding the transmission of infectious agents through blood transfusions is/are true? A. The transmission rates for human immunodeficiency virus (HIV) ... patients (such as patients undergoing transplantation) should receive specially screened blood products.

Last Answer : Answer: ABCD DISCUSSION: The incidence of both HIV and hepatitis transmitted via blood transfusions has been steadily decreasing since the 1980s. This is related to improved ... , severely compromised patients such as those undergoing transplantation should receive CMV-negative blood products

Description : The process by which fine solids is removed from liquids is termed as (A) Decantation (B) Flocculation (C) Sedimentation (D) Classification

Last Answer : (C) Sedimentation

Description : The process opposite to 'dispersion' is termed as the (A) Flocculation (B) Sedimentation (C) Filtration (D) None of these

Last Answer : (A) Flocculation