Description : Substance added to ore to remove impuri- ties is known as?
Last Answer : Flux
Description : Heating of a ore below its melting point in the absence of air is known as – (1) Refining (2) Calcination (3) Roasting (4) Smelting
Last Answer : (2) Calcination Explanation: Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of ... as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.
Description : Heating of a ore below its melting point in the absence of air is known as (1) Refining (2) Calcination (3) Roasting (4) Smelting
Last Answer : Calcination
Description : Heating of ore in the absence of air below its melting point is called
Last Answer : Calcinations
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 : Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximateanalysis. (A) 550 (B) 750 (C) 950 (D) 1150
Last Answer : (C) 950
Description : The absence of cobalt in minute quanti- ties in human body causes?
Last Answer : Pernicious anaemia
Description : The strong heating of coal in absence of air is known as _______. a) destructive distillation b)refining c)combustion d)burning
Last Answer : a) destructive distillation
Description : When ore is heated generally in absence of air then what is process called? -Do You Know?
Last Answer : answer:
Description : When ore is heated generally in absence of air then what is process called?
Description : Method of separating metals which have low melting point I from an ore is?
Last Answer : Liquation
Description : Coke is made by heating coal in the absence of air at-----? A. 700 °C B. 900 °C C. 1300 °C (Answer) D. 1700 °C
Last Answer : C. 1300 °C (Answer)
Description : Coke is made by heating coal in the absence of air at: A. 700 °C B. 1300 °C C. 900 °C D. 1700 °C ANSWER: Why are soft drinks made with chilled water rather than water at room ... B. Chilled water enhances the taste C. Chilled water attracts more carbon dioxide D. Chilled water is more hygienic
Last Answer : ANSWER: C
Description : Coke is made by heating coal in the absence of air at: A. 700 °C B. 1300 °C C. 900 °C D. 1700 °C ANSWER: Most of the ozone in the atmosphere is concentrated in the _____ A. Mesosphere B. Troposphere C. Stratosphere D. Ionosphere
Description : Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air. (A) 50-80 (B) 250-400 (C) 1000-1200 (D) 800-900
Last Answer : (B) 250-400
Description : Charcoal is 'activated' by: w) heating it in the absence of air x) heating it in steam y) destructive distillation z) absorption
Last Answer : ANSWER: X -- HEATING IT IN STEAM
Description : Which of the following is NOT a means of preparing carbon dioxide? w) burning coke in the absence of air x) combustion of methane y) heating certain normal carbonates z) action of acids on carbonates
Last Answer : ANSWER: W -- BURNING COKE IN THE ABSENCE OF AIR
Description : Sulphur removal by heating of pyrite ore in presence of air is called its (A) Reduction (B) Roasting (C) Calcination (D) Smelting
Last Answer : (B) Roasting
Description : Reverberatory furnace is used for (A) Roasting/reduction of ores (B) Annealing steel coil (C) Heating air (D) Steel melting
Last Answer : (A) Roasting/reduction of ores
Description : Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air in a reverberatory furnace to obtain th
Last Answer : Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air ... III and IV D. I , II , III and IV
Description : Heating pyrites in air to remove sulphur is known as which name? -General Knowledge
Last Answer : The answer is 'Roasting'
Description : Heating pyrites in air to remove sulphur is known as which name?
Last Answer : Roasting
Description : Hydrogenation of oil/fat does not (A) Improve its resistance to rancid oxidation (B) Raise its melting point (C) Remove double bonds (D) None of these
Last Answer : (D) None of these
Description : Hydrogenation of oil does not (A) Remove double bonds (B) Raise its melting point (C) Improve its resistance to oxidation (D) None of these
Description : Super cooling is cooling of liquid _____. (1) below melting point (2) below freezing point (3) at melting point (4) above melting point
Last Answer : (2) below freezing point Explanation: Supercooling is the process of chilling a liquid below its freezing point, without it becoming solid.
Description : Super cooling stands for cooling of a liquid – (1) at freezing point (2) below freezing point (3) at melting point (4) above melting point
Last Answer : (2) below freezing point Explanation: Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it ... droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
Description : Super cooling stands for cooling of a liquid : (1) at freezing point (2) below freezing point (3) at melting point (4) above melting point
Last Answer : below freezing point
Description : Red phosphorous is changed into white phosphorous by (A) Heating in presence of light (B) Melting under pressure (C) Vaporisation followed by condensation (D) None of these
Last Answer : (C) Vaporisation followed by condensation
Description : Which method, vapor phase oxidation or direct-melt process, transforms deposited material into a solid glass preform by heating the porous material without melting?
Last Answer : Vapor phase oxidation.
Description : Which of the following is false? a) electricity is high-grade energy b) high grade forms of energy are highly ordered and compact c) low grade energy is better used for applications like melting of metals rather than heating water for bath
Last Answer : c) low grade energy is better used for applications like melting of metals rather than heating water for bath
Description : In extractive metallurgy of lead, the reduction of the roasted ore to the molten metal by heating with coke is called
Last Answer : In extractive metallurgy of lead, the reduction of the roasted ore to the molten metal by heating with ... B. roasting C. calcination D. None of these
Description : What will you do as a teacher if the students do not attend your class? Options: A) Blame the students for their absence B) keep quiet considering the present attitude of students as the change of culture C) Think of using some interesting methods of teaching D) know the reason and try to remove the
Last Answer : D) know the reason and try to remove the
Description : If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution ... On heating, a vapor phase will appear; while on cooling, a solid phase will appear
Last Answer : (D) On heating, a vapor phase will appear; while on cooling, a solid phase will appear
Description : When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel. A. atomisation B. carbonisation
Last Answer : Answer: B
Description : Select the two correct statements out of the four (i - iv) statements given below about lac operon. (i) Glucose or galactose may bind with the repressor and inactivate it. (ii) In the absence of lactose, the repressor binds with the ... (iii) (b) (i) and (iii) (c) (ii) and (iv) (d) (i) and (ii)
Last Answer : (c) (ii) and (iv)
Description : Match List-I (Type of Unemployment) with List-II (Characteristics) and select the correct answer using the codes given below: L ist-I L ist -I I (Type of (Char acter ist ics) Unem ... contribution by the additional labour is nil E. Cyclical V. Job opportunities during certain months in the year
Last Answer : (1) A-V, B-III, C-IV, D-II, E-I
Description : Roasting of metallurgical ores is done mainly to (A) Dehydrate it (B) Sinter the ore (C) Remove CO2 & H2O (D) Remove arsenic & sulphur
Last Answer : (D) Remove arsenic & sulphur
Description : Flux addition during smelting of ore is done to (A) Remove impurities/gangue (B) Enhance rate of reaction (C) Accelerate reduction of ore (D) Separate slag from metal
Last Answer : (A) Remove impurities/gangue
Description : Diamond has each of the following properties except: w) extreme hardness x) ability to conduct electricity y) high melting point z) tendency to burn in air
Last Answer : ANSWER: X -- ABILITY TO CONDUCT ELECTRICITY
Description : Would the world be more tolerant of Israel's defense of their sovereignty were it not for it's close ties to the United States?
Last Answer : No.
Description : Pick out the wrong statement. (A) High concentration of oxygen in flue gas means high stack loss (B) Gaseous fuels require the least % excess air for complete combustion (C) The ratio of fixed carbon to ... coal is called its 'fuel ratio' (D) Calorific value of natural gas is more than that of LPG
Last Answer : (D) Calorific value of natural gas is more than that of LPG
Description : Alcohol is more volatile than water because ______ is lower than water. (1) its boiling point (2) its density (3) its viscosity (4) its surface tension
Last Answer : (1) its boiling point Explanation: Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and ... C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
Description : A coal containing high amount of volatile matter will have (A) Low ignition temperature (B) Very little ash content (C) High fusion point of its ash (D) Low adiabatic flame temperature
Last Answer : (A) Low ignition temperature
Description : Fat coals' are those coals which have very high (A) Caking capacity (B) Volatile matter content (C) Fusion point of its ash (D) Inherent moisture conten
Last Answer : (A) Caking capacity