Tag: biology

Questions Related to biology

What percentage of carbon in Bituminous coal?

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. $28-30\%$

  2. $28\%$

  3. $78-86\%$

  4. $94-98\%$

Show answer
Correct Option: C
Explanation:
Type of coal Percentage of carbon
Peat $28\%$
Lignite $28-30\%$
Bituminous $78-86\%$
Anthracite $94-98\%$

The purest form of coal is:

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. peat

  2. anthracite

  3. lignite

  4. bituminous coal

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Correct Option: B
Explanation:

High grade (HG) and ultra high grade (UHG) anthracite are the highest grades of anthracite coal. 

They are the purest forms of coal, having the highest degree of coalification, the highest carbon count and energy content and the fewest impurities (moisture, ash and volatiles).

Anthracite contains nearly 95% of carbon and is the purest form of coal so anthracite is the purest form of coal than any other forms.

Therefore, option B is correct.


The variety of coal used as household coal is:

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. anthracite

  2. peat

  3. lignite

  4. bituminous

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Correct Option: A
Explanation:

Anthracite coal has highest amount of carbon and has clean burning properties. So, it is used as a household coal.

Which of the following has the maximum density 

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. Diamond

  2. silicon

  3. Graphite

  4. Germenium

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Correct Option: A

Which of the following conditions regarding a chemical process ensures its spontaneity at all temperature ? 

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. $\Delta A > 0, \Delta S < 0$

  2. $\Delta H < 0, \Delta S > 0$

  3. $\Delta H < 0, \Delta S < 0$

  4. $\Delta H > 0, \Delta S > 0$

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Correct Option: B

.......... has the highest percentage of carbon.

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. Anthracite

  2. Bituminous

  3. Peat

  4. Lignite

Show answer
Correct Option: A
Explanation:

Anthracite has the highest percentage of carbon. Anthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 92.1% and 98%.

So answer is A.

.......... is the common variety of coal used in household.

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. Anthracite

  2. Bituminous

  3. Peat

  4. Lignite

Show answer
Correct Option: B
Explanation:

Bituminous coal is a dense sedimentary rock, usually black which is used primarily as household coal ,fuel in steam-electric power generation and to produce coke.

__________ has the lowest percentage of carbon.

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. Lignite

  2. Bituminous

  3. Anthracite

  4. Peat

Show answer
Correct Option: D
Explanation:

Peat found in the lowest depth of earth considering the other forms of coal.It also has the lowest percentage of carbon as compared to other forms.In other words, we can say that they are the youngest fossils.

It contains about 27-40% of carbon content.
So the answer is $D$.

Percentage of carbon present in an air dried sample of anthracite is:

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. 94 - 98%

  2. 27 - 30%

  3. 78 - 86 %

  4. 27 %

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Correct Option: A
Explanation:

Percentage of carbon present in an air dried sample of anthracite is 94-98%.

The variety of coal used as old house coal is:

biology coal, petroleum and petrochemicals carbon cycling mineral coal carbon cycle coal and its products

  1. anthracite

  2. peat

  3. lignite

  4. bituminous

Show answer
Correct Option: D
Explanation:

Bituminous or black coal is a soft coal containing a tarlike substance called bitumen. It is of higher quality than lignite coal and has low ash content so it is used as coal fuel in homes.