Tag: mineral coal

Questions Related to mineral coal

What are the conditions required for the formation of coal?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. High temperature

  2. High pressure

  3. Low temperature

  4. Low pressure

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Correct Option: A,B
Explanation:

High temperature and high pressure are required for the formation of coal. When dead vegetation got buried under the soil, they were compressed under the deposited soil. Carbon got trapped in them. High temperature and pressure then converts these dead vegetation to coal.

Coal is formed from:

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. dead animals

  2. dead vegetation

  3. both of the above

  4. none of the above

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Correct Option: B
Explanation:

Coal is obtained from dead vegetation or dead natural forests. The forests got buried under the soil, and then more soil got deposited over them. These forests got compressed under the soil and then carbon got trapped in it. High temperature and pressure convert these dead vegetation to coal.

Which is the best quality coal?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. Lignite

  2. Bituminous

  3. Anthracite

  4. Peat

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Correct Option: C
Explanation:

Anthracite is the best quality of coal.

Which country tops in coal production?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. India

  2. America

  3. China

  4. England

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Correct Option: C
Explanation:

China tops in the production of coal.

What is the percentage of free carbon in lignite?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. 20

  2. 40

  3. 60

  4. 80

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Correct Option: B
Explanation:

The percentage of free carbon in lignite is 40%.

Coal gas mainly consists of high molecular mass aromatic hydrocarbons.

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. True

  2. False

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Correct Option: B
Explanation:

Coal gas mainly consists of low molecular mass alkanes and alkenes. It is used as a fuel.

What is the percentage of free carbon in peat?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. 10-15

  2. 25-35

  3. 50-55

  4. 75-80

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Correct Option: A
Explanation:

The percentage of free carbon in peat is 10-15%.

What is the percentage of free carbon in bituminous coal?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. 30

  2. 50

  3. 70

  4. 90

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Correct Option: C
Explanation:

The percentage of free carbon in bituminous coal is 70%.

What is the percentage of free carbon in anthracite?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. 30

  2. 60

  3. 90

  4. 95

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Correct Option: C
Explanation:

The percentage of free carbon in anthracite is 90%. It is the coal of high grade.

Coal is free carbon.

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. True

  2. False

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Correct Option: B
Explanation:

Coal is not merely free carbon but it is a complex mixture of several organic compounds with varying amounts of free carbon, depending upon the type of coal.