Description : Common impurities present in bauxite are…..
Last Answer : Common impurities present in bauxite are….. A. CuO B. ZnO C. `Fe_(2)O_(3)` D. `SiO_(2)`
Description : What impurities are removed by a water filtration system?
Last Answer : Water filtration system can remove contaminants from the water. They also work to remove unwanted minerals from the water and improve clarity.
Description : Potassium Permanganate is used for purifying drinking water, because ________. (1) It is a reducing agent (2) It is an oxidising agent (3) It is a sterilising agent (4) It dissolves the impurities of water
Last Answer : (2) It is an oxidising agent Explanation: Potassium permanganate is a point-of-entry water treatment method that oxidizes dissolved iron, mancianese, and hydrogen sulfide into solid particles that are filtered ... to control iron bacteria growth in wells. It is an oxidant, but a poor disinfectant.
Description : Potassium Permanganate is used for purifying drinking water, because - (1) it dissolves the impurities of water (2) It is a sterilizing agent (3) It is an oxidising agent (4) It is a reducing agent
Last Answer : (3) It is an oxidising agent Explanation: Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
Description : The blue colour of water in the sea is due to – (1) absorption of other colours except blue by water molecules (2) scattering of blue light by water molecules (3) reflection of blue light by impurities in sea water (4) reflection of blue sky by sea water
Last Answer : (1) absorption of other colours except blue by water molecules Explanation: Almost all sunlight that enters the ocean is absorbed, except very close to the coast. The red, yellow, and green ... to the absorption and scattering of light. The blue wavelengths of light are scattered, similar to the
Description : Sweetening of petroleum product means the removal of (A) Sulphur & its compounds (B) Water (C) Organic impurities (D) Wax
Last Answer : (A) Sulphur & its compounds
Description : Blowdown in a cooling tower (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities (B) Increases the scale forming tendencies of water (C) Is undesirable (D) All (A), (B) & (C)
Last Answer : (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Description : When domestic sewage mixes with river water (a) small animals like rats will die after drinking river water (b) the increased microbial activity releases micronutrients such as iron (c) the increased ... (d) the river water is still suitable for drinking as impurities are only about 0.1%.
Last Answer : (c) the increased microbial activity uses up dissolved oxygen
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 : Inorganic impurities causing water pollution is (A) Fats (B) Carbohydrates (C) Salts of metals (D) Protein
Last Answer : (C) Salts of metals
Description : Most widely and commonly used coagulant for the removal of suspended impurities in water is (A) Bleaching powder (B) Slaked lime (C) Alum (D) Copper sulphate
Last Answer : (C) Alum
Description : Very fine suspended and colloidal impurities are removed from water by a process called (A) Sedimentation (B) Coagulation (C) Disinfection (D) Softening
Last Answer : (B) Coagulation
Description : The most widely used coagulant for removing suspended impurities from water is (A) Bleaching powder (B) Chlorine (C) Calcium sulphate (D) Alum
Last Answer : (D) Alum
Description : Hydrazine is used in water treatment for the removal of (A) Colloidal impurities (B) Dissolved oxygen (C) Turbidity (D) Chlorinous taste
Last Answer : (B) Dissolved oxygen
Description : Which of the following impurities in feed water for high pressure boiler is the most detrimental? (A) Silica (B) Dissolved oxygen (C) Suspended salt (D) Dissolved salt
Last Answer : (A) Silica
Description : Surface water may (A) Contain large amount of impurities (B) Be contaminated by impurities (C) Contain disease producing bacterias (D) All the above
Last Answer : (D) All the above
Description : Portable water should not have a) cannot have smell b)have impurities b) have harmful chemicals d)have microorganisms.
Last Answer : d)have microorganisms.
Description : Potassium Permanganate is used for purifying drinking water, because_________ (1) It is a reducing agent (2) It is an oxidising agent (3) It is a sterilising agent (4) It dissolves the impurities of water
Last Answer : It is an oxidising agent
Description : The blue colour of water in the sea is due to (1) absorption of other colours except blue by water molecules (2) scattering of blue light by water molecules (3) reflection of blue light by impurities in sea water (4) reflection of blue sky by sea water
Last Answer : absorption of other colours except blue by water molecules
Description : Denatured alcohol 1. Is an impure form of ethanol 2. Is unfit for drinking as it contains poisonous substances 3. Contains impurities 4. Is very unsafe to consume The correct answers are: (a) 1, 2 and 4 (b) 1, 2, 3 and 4 (c) 2, 3 and 4 (d) 1, 2 and 3
Last Answer : Ans:(b)
Description : The method of concentrating the ore which makes use of the difference in density between ore and impurities is called?
Last Answer : levigation
Description : The earthy impurities present in the ore are called?
Last Answer : Gangue
Description : Name the impurities present in cast iron. How can these impurities be removed?
Last Answer : Cast iron contains sulphur, phosphorous, silicon and carbon. The impurities present in the blast furnace can be removed by using Bessemer converter, open hearth process or electric furnace.
Description : Table salt gets moist during rainy season because (1) sodium chloride is hygroscopic (2) sodium chloride is deliquescent (3) sodium chloride contains some quantity of sodium iodide (4) sodium chloride contains hygroscopic impurities like magnesium chloride
Last Answer : sodium chloride contains hygroscopic impurities like magnesium chloride
Description : n-propylamine containing no secondary and tertiary amines as impurities is prepared by
Last Answer : n-propylamine containing no secondary and tertiary amines as impurities is prepared by A. Hoffmann ... n-propylchloride with ammonia D. none of these
Description : Cost iron is prepared from haematite . In most of the Cases ore needs no concentration ,The ore is roasted to remove the volatile impurities ,During r
Last Answer : Cost iron is prepared from haematite . In most of the Cases ore needs no concentration ,The ore is roasted to ... molten slag `Fe_(2)(SiO_(3))_(3)`
Last Answer : Cost iron is prepared from haematite . In most of the Cases ore needs no concentration ,The ore is roasted to remove ... is A. 10 B. 20 C. 30 D. 40
Last Answer : Cost iron is prepared from haematite . In most of the Cases ore needs no concentration ,The ore is roasted to remove ... C` C. `FeC_(3)` D. `Fe_(2)C`
Description : Statement-I : Lead, tin and bismuth are purified by liquation method. Statement-II : Lead, tin and bismuth have low m.p as compared to impurities.
Last Answer : Statement-I : Lead, tin and bismuth are purified by liquation method. Statement-II : Lead, tin and bismuth have low m.p as compared to impurities.
Description : Assertion: `Ag` and `Au` are extracted by leaching the ores with a dilute solution of `NaCN`. Reason: Impurities associated with these ores dissolve i
Last Answer : Assertion: `Ag` and `Au` are extracted by leaching the ores with a dilute solution of `NaCN`. ... . Statement-1 is false but Statement -2 is true
Description : Assertion: Wrough iron is prepared from cast iron by oxidising impurities in a reverberatory furnace lined with haematite. Reason: Haematite oxidises
Last Answer : Assertion: Wrough iron is prepared from cast iron by oxidising impurities in a reverberatory furnace lined ... -1 is false but Statement -2 is true
Description : Metals of high purity are obtained by zone refining. Impurities are more soluble in melt in pure metal.
Last Answer : Metals of high purity are obtained by zone refining. Impurities are more soluble in melt in pure ... Statement-1 is false but Statement -2 is true
Description : Impurities in the zinc spelter are
Last Answer : Impurities in the zinc spelter are A. Ag and Au B. Cd and Pd C. Cd and Pb D. Cd,As and Au
Description : The earthy impurities present in the mineral are called
Last Answer : The earthy impurities present in the mineral are called A. Flux B. slag C. gangue D. refractory material
Description : What is a substance used to make free of impurities which rhymes with preen?
Last Answer : chlorine
Description : (4) sodium chloride contains hygroscopic impurities like magnesium chloride Explanation: Table salt is refined salt, which contains about 97 to 99 percent sodium chloride. It usually contains substances that ... of salt it become wet in rainy season as the salt absorbs moisture from environment.
Last Answer : Which of the following could be used as fuel in propellant or rockets? (1) Liquid Hydrogen + Liquid Nitrogen (2) Liquid Oxygen + Liquid Argon (3) Liquid Nitrogen + Liquid Oxygen (4) Liquid Hydrogen + Liquid Oxygen
Description : The degree of dissociation of an electrolyte depends on - (1) dilution (2) impurities (3) atmospheric pressure (4) method of dissolution
Last Answer : (1) dilution Explanation: The extent to which an electrolyte dissociates into ions is known as degree of dissociation or ionization and depends upon the following factors: (1) Nature of the electrolyte, (2) Temperature, (3) Dilution, (4) nature of the solvent, and (e) presence of other ions.
Description : Commercial nitric acid is coloured because it contains dissolved – (1) Oxygen (2) Nitrous oxide (3) Nitrogen dioxide (4) Coloured impurities
Last Answer : (3) Nitrogen dioxide Explanation: Commercial nitric acid has a brown colour due to dissolved NO2. The procedure of bubbling dry air through warm commercial nitric acid, is to drive away the dissolved nitrogen dioxide so that the acid becomes colourless.
Description : Addition of suitable impurities into semiconductor, is called – (1) Doping (2) Mixing (3) Forming (4) Diluting
Last Answer : (1) Doping Explanation: In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. ... type of semiconductor and the properties that it needs to have for its intended purpose.
Description : When pressure is increased the melting point of ice – (1) increases (2) does not change (3) decreases (4) depends on the impurities in the ice
Last Answer : (3) decreases Explanation: In this case. if we increase the pressure on the ice the ice-water system wants to try to lower it again. It can do that by making itself fit into a ... the melting point of ice decreases because of the inversal relationship between the pressure and melting point of ice.
Description : Flux reacts with the impurities to form fusible material. which is known as which name?
Last Answer : Slag
Description : Which impurities form hard scale and which impurities soft scale ?
Last Answer : Sulphates and chlorides of lime and magnesium form hard scale, and carbonates of lime and magnesium form soft scale.
Description : Pick out the wrong statement. (A) Linear polymers are formed from bifunctional groups only and are normally thermoplastic (B) Cross-linked branched chain polymers are either elastometric or ... (D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction
Last Answer : D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction
Description : Electrical desalting of crude oil removes the __________ impurities. (A) Oleophilic (B) Oleophobic (C) Both (A) and (B) (D) Neither (A) nor (B
Last Answer : (B) Oleophobic
Description : Enriched uranium means that, it contains (A) More than 0.71% of U-235 (B) Only fertile material (C) Only fissile material (D) No impurities
Last Answer : (A) More than 0.71% of U-235
Description : To remove very small amount of tiny solid impurities from liquid, we use a (A) Pressure filter (B) Vacuum filter (C) Centrifugal filter (D) Coagulant
Last Answer : (D) Coagulant
Description : The presence of impurities in iron (A) Increases its melting point (B) Does not affect its melting point (C) Decreases its melting point (D) Makes it malleable
Last Answer : (C) Decreases its melting point
Description : As the impurities are oxidised, the melting point of iron (A) Decreases (B) Remains unchanged (C) Increases (D) May increase or decrease; unpredictable
Last Answer : (C) Increases
Description : Steam distillation is used for separation of high boiling (A) Substances from non-volatile impurities (B) Volatile impurity from still higher boiling substances (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : How would you remove nonpolar impurities from an amine ?
Last Answer : Ans.--- Adding HCl , amine will form salt whereas nonpolar impurities will not react . Amines can be regenerated by adding NaOH .