Formation of Coal

Q.

(a) Describe the formation of coal.

(b) Name four types of coal with the percentage of carbon present in each.

Q. Identify the substance which is tough, porous and black. It is almost a pure form of carbon.

1. Coke
2. Coal tar
3. Crude oil
4. Coal gas

Q.

Which of the following is the correct composition of producer gas?

1. $CO+H_2$
   
2. $CO+N_2$
   
3. $C{O}_2+H_{2}O$
   
4. $N_2+H_2$
   

Q. Which of the following is used in metal extraction?

1. Coke
2. Coal gas
3. Petroleum
4. Coal tar

Q.

Coal, petroleum and natural gas are called _____ fuels.

Q.

Differentiate between the following :

Charcoal and coke.

Q.

Which one of the following is obtained from Coal Tar?

1. Petrol

2. Coke

3. Air

4. Naphthalene balls​

Q.

Describe how coal was formed. What is this process called ?

Q.

___ is used as a reducing agent in metal extraction.

1. Naphthalene balls

2. Bitumen

3. Coal gas

4. Paraffin wax

Q. The slow process of conversion of dead vegetation into coal is called as

1. destructive distillation
2. carbonisation
3. dehydration
4. fractional distillation

Q.

Name the process by which plant material (or vegetation) buried deep under the earth was slowly converted into coal.

Q.

Why are bituminous and anthracite considered to be very good quality of coal ? Why is coal an important industrial resource?

Q. is almost pure form of carbon.

1. Coke
2. Coal tar
3. Coal gas

Q. The slow process of conversion of dead vegetation into coal is called ________.

1. decomposition
2. evolution
3. carbonification
4. coalification

Q.

Why is charcoal a better fuel than wood?

Q.

Fill in the blanks and complete the story. ​

About 300 million years ago the earth had dense in low lying wetland areas. b) Due to natural processes, like , these forests got buried under the . As more deposited over them, they were compressed. The also rose as they sank deeper and deeper. (e) Under high and high , dead plants got slowly converted into coal.​

Q.

Fill in the blanks.

Water-gas is formed when _______ is passed over __________ coke. (water/steam/red-hot/cold)

Q.

Why is wood charcoal a better fuel than wood?

Q.

Fly ash obtained from burning the coal is used to make

1. Lamb black

2. Coke

3. Bricks

4. Hard stone

Q. Which of the following variety of coal is a heterogeneous mixture of decomposed plant material that is accumulated in water and in the absence of air?

1. Fossil fuel
2. Charcoal
3. Coke
4. Peat

Q.

The amount of impurities in coke is very low.

1. True

2. False

Q. Assertion :Coal is a fossil fuel. Reason: It is formed due to decomposition of aquatic plants and animals in short period of time.

1. Both assertion and reason are correct and the reason is the correct explanation of the assertion
2. Both assertion and reason are correct but the reason is not the correct explanation of the assertion
3. Assertion is correct but the reason is incorrect
4. Assertion is incorrect and the reason is correct

Q. Identify the substance which is tough, porous and black. It is almost a pure form of carbon.

1. Crude oil
2. Coke
3. Coal tar
4. Coal gas

Q. Describe how coal is formed from dead vegetation. What is this process called? [2 marks]

Q. What happens during carbonisation?

1. Conversion to carbon dioxide
2. Conversion of carbon to water
3. Conversion of carbon to diamond
4. Conversion of organic substance to carbon

Q.

___________ is the process of sterilization of water by addition of chlorine acts as a treatment against bacterial infection.

1. Sedimentation

2. Precipitation

3. Chlorination

4. Decantation

Q.

Give two uses of coke. [2 MARKS]

Q. Identify the substance which is tough, porous and black. It is almost a pure form of carbon.

1. Crude oil
2. Coke
3. Coal tar
4. Coal gas

Q. What is the main constituent of coal?

1. Oxygen
2. Hydrogen
3. Carbon
4. Nitrogen

Q.

Although the carbon% has not changed over the millions of years of Earth's evolution but there's definitely some change that can be seen now. What are these changes?

1. Organic solids to metallic salts

2. Inorganic to organic

3. None of these

4. Inorganic from organic