Description : When ore is heated generally in absence of air then what is process called?
Last Answer : Calcination
Description : What is formed when white phosphorus is heated at 540 K in the absence of air? -Do You Know?
Last Answer : answer:
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 : `Ag_(2)S` ore Is mixed with NaCl and heated in the presence of air then products formed are
Last Answer : `Ag_(2)S` ore Is mixed with NaCl and heated in the presence of air then products formed are A. `AgCl+Na_(2)SO_( ... S` C. `AgCl+SO_(2)` D. `Ag+SO_(2)`
Description : When the coal is heated in absence of air, it is called its (A) Deoxidation (B) Gasification (C) Coalification (D) Carbonisation
Last Answer : (D) Carbonisation
Description : Heating of ore in the absence of air below its melting point is called
Last Answer : Calcinations
Description : What happens when sulphur is heated in absence of air?
Last Answer : Sulfur is melted.
Description : What is formed when white phosphorus is heated at 540 K in the absence of air?
Last Answer : Red phosphorus
Description : Which substance is obtained when coal is heated in the absence of air?
Last Answer : Coke
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 : 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 the ore below its melting point in the absence of air I to remove volatile impuri- ties is known as?
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
Description : Respiration can occur in the absence of oxygen in which thing? -Do You Know?
Description : The process of chemical decomposition at high temperature (upto 5000 C) in total or partial absence of air is called
Last Answer : combustion pyrolysis.
Description : Pick out the wrong statement pertaining to the turbine agitator. (A) Recommended peripheral speed for the turbine agitator is 200-250 metres/minute (B) Pitched blade turbine agitator gives only radial flow with ... l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter)
Last Answer : (B) Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow
Description : Stools associated with Giardia infection are generally described as loose, bulky, frothy and/or greasy with A A. The absence of blood or mucus B. The presence of blood or mucus C. The absence of mucus D. The presence of mucus
Last Answer : The absence of blood or mucus
Description : n passing over heated copper give? -Do You Know?
Description : When water is heated from 0 degree C to 20 degree C, how does its volume change? -Do You Know?
Description : In vulcanisation, with which the natural rubber is heated? -Do You Know?
Description : Which is the most important ore of aluminium? -Do You Know?
Description : Kudremukh hills known for iron ore deposits is situated in which place? -Do You Know?
Description : What is the major source of iron ore for Visakhapatnam? -Do You Know?
Description : Which state has the highest amount of Nickel Ore resources ? -Do You Know?
Description : Which of the following option is incorrect about the sludges? a) Sludges are soft, loose and slimy precipitate b) They are non-adherent deposits and can be easily removed c) Formed generally at heated portions of the boiler d) Can be removed by blow down operation
Last Answer : c) Formed generally at heated portions of the boiler
Description : If a metallic object is heated, its density generally: w) increases x) decreases y) fluctuates randomly z) remains the same
Last Answer : ANSWER: X -- DECREASES
Description : Pick out the wrong statement. (A) In process heat exchangers, saturated steam is preferred over the superheated steam (B) The maximum is the emissive power of a surface at a temperature T1 ... under natural convection conditions, the velocity profile in air, normal to the plate, exhibits a maximum
Last Answer : (B) The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength of λ1 . If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 λ1
Description : When an unsaturated air-water mixture is heated at constant pressure, then (A) The partial pressure of water vapour increases (B) The specific humidity decreases (C) The relative humidity increases (D) The relative humidity decreases
Last Answer : D) The relative humidity decreases
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 : When the ore haematite is burnt in air with coke around `2000 K` along with lime, the process not only produces steel but also produces a silicate sla
Last Answer : When the ore haematite is burnt in air with coke around `2000 K` along with lime, the process not only produces ... 3)` C. `SiO_(2)` D. `CaCO_(3)`
Description : (A) Roasting is a process in which the ore is heate in presence of air (R ) Concentration of sulphide ore is done by calcinaiton
Last Answer : (A) Roasting is a process in which the ore is heate in presence of air (R ) Concentration of sulphide ... . If (A) is incorrect but (R ) is correct
Description : 0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound ?
Last Answer : A. Vol of 0 .1M HCl taken = 50ml Vol of .1MNaOH used for neutralization of unused acid=23.2ml Now, 23.2 ml of .1MNaOH =23.2ml of .1MHCl Vol of .1MHCl unused=23.2ml Vol of .1MHCl required ... NH3 solution contain nitrogen = 14*26.8/10*1000 Percentage of Nitrogen=14*26.8*100/10*1000*.257 =14.6%
Description : Respiration in the absence of air is called - (1) Aerobic respiration (2) Anaerobic respiration (3) Muscular respiration (4) Molecular respiration
Last Answer : (2) Anaerobic respiration Explanation: Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
Description : The thermal decomposition of alkanes in the absence of air is called : (a) Combustion (b) Oxidation (c) Cracking (d) Hydrogenation
Last Answer : Cracking
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 : 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 : Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the (A) Presence of an inert atmosphere (B) Presence of a reducing atmosphere (C) Absence of air (D) Presence of an oxidising atmosphere
Last Answer : (C) Absence of air
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 : Fermentation is adversely affected by the (A) Presence of air (B) Absence of air (C) High concentration (D) Presence of ammonium salts
Last Answer : (C) High concentration
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 : 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 : Which of the following process will be affected by the absence of enterokinase ?
Last Answer : Which of the following process will be affected by the absence of enterokinase ? A. Lipide `rarr ... `rarr` Dipeptide D. Amylose `rarr` Maltose
Description : Ageism refers to a) Bias against older people based solely on chronological age Individuals demonstrating ageism base their beliefs and attitudes about older people based upon chronological age without consideration ... refers to the age-related loss of memory in the absence of a pathologic process.
Last Answer : a) Bias against older people based solely on chronological age Individuals demonstrating ageism base their beliefs and attitudes about older people based upon chronological age without consideration of functional capacity.
Description : What is generally present in tonics? -Do You Know?
Description : Petroleum is generally found in which rocks? -Do You Know?
Description : The elements of group VA are generally known as which name? -Do You Know?
Description : How is the pitch of the voice of women generally? -Do You Know?