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प्रश्न
Descirbe the formation of coal
उत्तर
The formation of coal took millions of years. Coal was formed by the bacterial decomposition of ancient vegetable matter hurried under successive layers of the earth. Under in action of high temperature and pressure, and in the abcence of air, the decayed vegetable matter converted into coal.
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संबंधित प्रश्न
Choose the correct alternative.
A crystalline form of carbon is
Write true or false
Graphite is the purest form of carbon.
State the term:
Different forms of an element found in the same physical state.
Answer the following question
Why is graphite a good conductor of electricity but not diamond?
What is destructive distillation? What are the products formed due to the destructive distillation of coal?
Name the products formed when:
diamond is burnt in air at 900°C.
Give balanced equations for the following chemical reactions:
(a) wood charcoal and cone, nitric acid
(b) coke and steam
(c) wood charcoal and lead monoxide.
State the reasons for use of graphite
(i) as a lubricant for heated machine parts,
(ii) as a lining for crucibles used in manufacture of high grade steel,
(iii) as an electrode in electroplating.
Name the following:
An allotrope of carbon used for the manufacture of coke.
Name the following:
An amorphous allotrope of carbon which floats on water.
