Tag: chemistry

Questions Related to chemistry

Coal, natural gas and petroleum are examples of_________.

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

  1. fossils

  2. natural resources

  3. artificial resources

  4. fuels

Show answer
Correct Option: A,B,D
Explanation:

Coal, natural gas and petrolium are examples of natural resources which are found as fossils beneath the surface of earth and act as sources of fuel.

The precursor of coal is:

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

  1. peat

  2. lignite

  3. anthracite

  4. graphite

Show answer
Correct Option: A
Explanation:

Peat is considered as the precursor of coal. Peat is used industrially sometimes for the purpose of fuel.

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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
Correct Option: C
Explanation:

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