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प्रश्न
What are the different types of coal?
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उत्तर
- Coal is a fossil fuel. It contains carbon, hydrogen and oxygen. It also contains nitrogen, phosphorus and sulphur. It occurs in the solid state.
- Coal is classified on the basis of its carbon content into:
- Peat: It has a high water content and less than 60% carbon content.
- Lignite: Lignite is a transformed form of peat and has around 60 to 70% of carbon content.
- Bituminous: It is the most commonly found variety of coal in India is bituminous and has a carbon content of 70-90%.
- Anthracite: It has a carbon content of more than 95% which makes it suitable for iron smelting.
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संबंधित प्रश्न
Describe how coal is formed from dead vegetation. What is this process called?
Fossil fuels are ______, ______ and ______.
Coke is almost pure form of carbon.
Explain why fossil fuels are exhaustible natural resources.
Which substance is formed by the carbonisation of dead vegetation?
When heated in air, coal burns and produces mainly ______ gas.
Coal tar is a black, thick ______ with an ______ smell.
The black thick liquid with ______ smell is known as coal tar.
Coal reserves are said to be enough to last for another hundred years. Do you think we need to worry in such case? Why or why not?
When lignite becomes darker and harder over time ______ coal is formed.
______ is used to make face packs and cosmetics.
Activated carbon, used in filters for water and air purification and in ______ machines is obtained from coal.
Coal is also known as black diamond owing to its precious nature.
What is deep mining?
Explain the destructive distillation of Coal.
What are the uses of coal?
