Coal is classified according to :a)its carbon contentb)its non carbon contentc)layer of earth surface it is foundd)time taken in its formationCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

As i have allready answered in one previous question that all the coal is classified on their content carbon.See there is 4 types of coal depending upon its carbon content.
1. Anthraciye containing 94% to 98% carbon
2. Bituminous containing 78% to 87% carbon
3. Lignite containing 28% to 30% carbon
4. Peat containing 27% or less than that.

Now i hope uhh got it...so if uh like then plz upvote and enjoy e-learning with edurev and with my cool fav answer.

Answer

Classification of Coal
Coal is a fossil fuel that is formed from the remains of plants that lived and died millions of years ago. It is primarily composed of carbon along with various other elements like hydrogen, oxygen, nitrogen, and sulfur. Coal is classified based on its carbon content, which determines its quality and suitability for specific applications.

Carbon Content
The carbon content of coal is the main factor that determines its classification. The higher the carbon content, the more energy-rich and valuable the coal is. The carbon content is primarily influenced by the type of plant material from which the coal was formed and the conditions under which it was buried and subjected to heat and pressure.

There are four main types of coal, classified based on their carbon content:

1. Anthracite Coal - Anthracite is the highest rank of coal and has the highest carbon content. It is a hard and brittle coal with a high energy content, making it the most valuable type of coal. Anthracite coal is primarily used for heating and electricity generation.

2. Bituminous Coal - Bituminous coal is the most commonly used type of coal. It has a moderate carbon content and a relatively high energy content. Bituminous coal is used for electricity generation, as a fuel in industrial processes, and for the production of coke, which is used in steelmaking.

3. Sub-bituminous Coal - Sub-bituminous coal has a lower carbon content than bituminous coal. It has a higher moisture content and a lower energy content. Sub-bituminous coal is used primarily for electricity generation.

4. Lignite Coal - Lignite coal is the lowest rank of coal and has the lowest carbon content. It is a soft and brownish coal with a high moisture content. Lignite coal is used for electricity generation and as a fuel in some industrial processes.

The classification of coal based on carbon content provides valuable information about its properties and potential uses. It helps in determining the efficiency and environmental impact of using different types of coal for various applications.

Answer

Most classifications are based on the results of chemical analyses and physical tests, but some are more empirical in nature. Coal classifications are important because they provide valuable information to commercial users (e.g., for power generation and coke manufacturing) and to researchers studying the origin of coal. The most common classification is based on rank, referring to the degree of coalification that has occurred. The rank of a coal is determined primarily by the depth of burial and temperature to which the coal was subjected over time. With increasing temperature, peat is converted to lignite, a very soft, low-rank coal. With further increases in temperature, lignite is transformed into subbituminous coal and then into bituminous coal. At even higher temperatures, usually accompanied by intense deformation generated by the folding and faulting of the Earth’s crust, anthracites, the highest rank of coal, are produced. The increase in coal rank is accompanied by increases in the amount of fixed carbon and by decreases in the amount of moisture and other volatile material in the coal. In general, the calorific (heat) value of coal increases with rank from lignite through bituminous coal. In addition, the terms used for various coal ranks vary from country to country. Coal may be classified in rock types (or lithotypes) based on the presence of petrological components known as macerals. Based on maceral content and its appearance in a hand specimen, coal is classified into four principal types: clarain, durain, fusain, and vitrain. Coal may also be classified in grades using subjective terms (e.g., “low-sulfur coal,” “high-ash coal”) with reference to their impurities for commercial purposes. Coals are classified in the table. Classification of coals by the American Society for Testing and Materials 1If agglomerating, classify in low-volatile group of the bituminous rank. 2There may be nonagglomerating varieties in these groups of the bituminous rank; there are also notable exceptions in the high-volatile C bituminous group. 3Moist coal contains natural inherent moisture but does not include visible water on the surface. 4Coals having 69 percent or more fixed carbon on the dry, mineral-matter-free basis are classified by fixed carbon, regardless of calorific value. Source: 2000 Annual Book of ASTM Standards, section 5, volume 5.06. fixed carbon percentage (dry, mineral- matter-free basis) volatile matter percentage (dry, mineral- matter-free basis) rank and group equal to or greater than less than greater than equal to or less than agglomerating character Anthracitic meta-anthracite 98 . . . . . .  2 nonagglomerating anthracite 92 98  2  8 semianthracite1 86 92  8 14 Bituminous low-volatile bituminous 78 86 14 22 commonly agglomerating2 medium-volatile bituminous 69 78 22 31 high-volatile A bituminous . . . 69 31 . . . high-volatile B bituminous . . . . . . . . . . . . high-volatile C bituminous . . . . . . . . . . . . Subbituminous subbituminous A . . . . . . . . . . . . nonagglomerating subbituminous B . . . . . . . . . . . . subbituminous C . . . . . . . . . . . . Lignitic lignite A . . . . . . . . . . . . nonagglomerating lignite B . . . . . . . . . . . . caloric value (moist, mineral-matter-free basis)3 British thermal units per pound megajoules per kilogram rank and group equal to or greater than less than equal to or greater than less than agglomerating character Anthracitic meta-anthracite . . . . . . . . . . . . nonagglomerating anthracite . . . . . . . . . . . . semianthracite1 . . . . . . . . . . . . Bituminous low-volatile bituminous . . . . . . . . . . . . commonly agglomerating2 medium-volatile bituminous . . . . . . . . . . . . high-volatile A bituminous 14,0004 . . . 32.6 . . . high-volatile B bituminous 13,0004 14,000 30.2 32.6 high-volatile C bituminous 11,500 13,000 26.7 30.2 10,500 11,500 24.4 26.7 agglomerating Subbituminous subbituminous A 10,500 11,500 24.4 26.7 nonagglomerating subbituminous B  9,500 10,500 22.1 24.4 subbituminous C  8,300  9,500 19.3 22.1 Lignitic lignite A  6,300  8,300 14.7 19.3 nonagglomerating lignite B . . .  6,300 . . . 14.7

Answer

Yes.. Obviously correct answer would be 'A' bcczzzz coal is basically carbon Mena's the simplest form in which the coal can be broken is The Carbon..And anything which contains carbon would be Organic in Nature..

Similar Class 8 Doubts

Coal is classified according to

Arrange these grains in descending order according to their protein content in them black channa, channa dal, wheat, rice, urad dal, soyabean, peas, moong dal, corn?

pls any one of u suggest me how to upload a content in Edurev

Wht should I search on the edu rev ap to find shakespeare related content?

If the contents of a leaf tissue are carefully fractioned which fractions is said to be alive?

Top Courses for Class 8View all

Science Class 8

Mathematics (Maths) Class 8

Social Studies (SST) Class 8

English Class 8

Improve Your Calculations: Vedic Maths (English)

Top Courses for Class 8

Top Courses for Class 8

Suggested Free Tests

Related Content

Class 8 Study Material

Class 8 Subjects

Competitive Examinations for Class 8

NCERT Solutions

Reference Books for Class 8

Other Popular Exams

Company