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 : 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 : 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 : When ore is heated generally in absence of air then what is process called? -Do You Know?
Last Answer : answer:
Description : What is formed when white phosphorus is heated at 540 K in the absence of air? -Do You Know?
Description : What happens when sulphur is heated in absence of air?
Last Answer : Sulfur is melted.
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?
Last Answer : Red phosphorus
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 : 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 : Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis. (A) 500 (B) 750 (C) 950 (D) 1100
Last Answer : (B) 750
Description : Green coal, in order to be burnt, must be (A) Heated sufficiently (B) Burnt in excess air (C) Heated to its ignition point (D) Burnt as powder
Last Answer : (C) Heated to its ignition point
Description : Write balanced equations for the reaction of: (i) aluminium when heated in air. Write the name of the product. (ii) iron with steam. Name the product obtained. (iii) calcium with water. Why does calcium start floating in water? -Chemistry
Last Answer : The bubbles of hydrogen stick to the surface of metal that is why it floats.
Description : Which iron and steel industry of India is located away from the main coal areas ? What is the main source of energy in the absence of coal ? -Geography
Last Answer : Visveswaraya Iron and Steel Limited is located away from the main coal areas. Its main source of energy earlier was charcoal but now it uses Hydroelectric Power from Mahatma Gandhi and Sharavati Hydroelectric power station.
Description : Low temperature oxidation of coal is accelerated by the (A) Storage in large heaps (B) Storage in compressed piles (C) Absence of porous or friable particles (D) All (A), (B) and (C)
Last Answer : (A) Storage in large heaps
Description : Producer gas is obtained by A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast B. carbonisation of bituminous coal C. passing steam over incandescent coke D. passing air and a large amount of steam over waste coal at about 650°C
Last Answer : Answer: A
Description : Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C. A.Correct B.Incorrect
Description : The natural substance from which energy can be harnessed, and is essentially made up of only one element is (a) petroleum (b) coal (c) water (in dams) (d) air (in wind mills
Last Answer : Ans:(b)
Description : What is obtained when gypsum is heated to 125°C?
Last Answer : Plaster of paris
Description : The product obtained when lime stone is heated?
Last Answer : Quicklime and Carbondioxide
Description : Which products will be obtained when lead nitrate is heated simply. Write balanced chemical equation for the reaction? State the type of chemical reaction that occur in the change. -Chemistry
Last Answer : Answer. Lead monoxide, nitrogen dioxide and oxygen gas will be liberated. It is thermal decomposition reaction.
Description : Phenol is heated with a solution of mixture of `KBr` and `KBrO_(3)`. The major product obtained in the above reaction is
Last Answer : Phenol is heated with a solution of mixture of `KBr` and `KBrO_(3)`. The major product ... Bromophenol C. 4-Bromophenol D. 2,4,6-Tribromophenol
Description : When a mixture of solid NaCl, solid `K_(2)Cr_(2)O_(7)` is heated with conc. `H_(2)SO_(4)` orange red vapours are obtained. These are of the compound
Last Answer : When a mixture of solid NaCl, solid `K_(2)Cr_(2)O_(7)` is heated with conc. `H_(2 ... B. chromyl chloride C. chromic chloride D. chromic sulphate
Description : A Unknown salt (S) when heated with dil `H_(2)SO_(4)` does not evolve brown vapours but with conc. `H_(2)SO_(4)` brown vapours are obtained. The vapou
Last Answer : A Unknown salt (S) when heated with dil `H_(2)SO_(4)` does not evolve brown vapours but with conc. `H_(2)SO_(4)` ... 3)^(-)` C. `I^(-)` D. `Br^(-)`
Last Answer : Phenol is heated with a solution of mixture of `KBr` and `KBrO_(3)`. The major product obtained ... C. 4-Bromophenol D. 2, 4,6-Tribromophenol
Description : The major product obtained when tert- butyl bromide is heated with sodium ethoxide is
Last Answer : The major product obtained when tert- butyl bromide is heated with sodium ethoxide is A. 2- ... Ehene C. tert- Buty1methy1ether D. Diethyl ether
Description : When ethylhydrogen sulphate is heated with excess of alcohol at 410 K, the product obtained is
Last Answer : When ethylhydrogen sulphate is heated with excess of alcohol at 410 K, the product obtained is A. ... B. Ethylene C. Diethyl ether D. Diethyl sulphate
Description : Which of the following statements concerning the specific gravity of a battery electrolyte is true? A. The electrolyte becomes less dense when it is cooled. B. The specific gravity reading is lowered ... water is added. D. The temperature does not affect the specific gravity of the electrolyte.
Description : When sodium bicarbonate is heated, what is the product obtained?
Last Answer : Na2CO3
Description : The sticky substance formed when sugar is heated to about 473K is called
Last Answer : caramel.
Description : What are the changes in the kinetic energy as a substance is heated to its melting point?
Last Answer : The kinetic energy increase.
Description : When the unknown was heated , could the decrease in mass have been partly due to the loss of some substance other than water ?
Last Answer : yes because water is loss from hydrates compound
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 : Coke is obtained from coal by (a) Distillation (b) Fractional distillation (c) Destructive distillation (d) Cracking
Last Answer : Ans:(c)
Description : Bitumen is generally obtained from (A) Organic material (B) Synthetic material (C) Petroleum product (D) Coal
Last Answer : Answer: Option C
Description : Coal gas is obtained by mixing coal and gas at ambient conditions. A. Yes B. No
Description : Why is coal a basic substance ?
Last Answer : : Only carbon is found when coal is broken down.
Last Answer : Coal is an organic substance
Description : Fussain (A) Is friable, charcoal like substance (B) Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal (C) Is non-coking, but when blended with highly coking ... its swelling and produces high strength coke on carbonisation (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : _________ is a substance which undergoes spontaneous combustion. a) wood b)coal c)sodium d)cow dung cakes
Last Answer : c)sodium
Description : Among the following, the substance that is considered to be the earliest stage in coal formation is: w) sub-bituminous x) bituminous y) anthracite z) lignite
Last Answer : ANSWER: Z -- LIGNITE
Description : The fusible substance obtained when flux combines with the gangue is known as?
Last Answer : Slag
Description : What is the sticky substance called that is obtained from the hoofs of animals?
Last Answer : Feel Free to Answer
Description : 09. The reasons determing bioavailability are: a) Rheological parameters of blood b) Amount of a substance obtained orally and quantity of intakes c) Extent of absorption and hepatic first-pass effect d) Glomerular filtration rate
Last Answer : C
Description : Heating the ore below its melting point in the absence of air I to remove volatile impuri- ties is known as?
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.