Define Bengal, the regional kingdom.
Give your answer in details.
Answers
Answer:
Ancient Bengal was the site of several major Janapadas (kingdoms), while the earliest cities date back to the Vedic period. ... It was also a bastion of regional kingdom. The citadel of Gauda served as capital of the Gauda Kingdom, the Buddhist Pala Empire (eighth to 11th century) and Hindu Sena Empire (11th–12th century).
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For welding railway tracks, we use a mixture of Iron oxide and Aluminium dust. This mixture is also known as Thermite. Aluminium being more reactive than Iron, can displace Iron from its oxide to give rise to aluminium oxide, Iron and evolution of heat takes place.
In metallurgy, we use carbon pure form, known as Coke but sometimes we use the help of displacement reactions. Highly reactive metals like Sodium, Aluminium and Calcium are used as Reducing agents.
➤ When Aluminium is used like in the Q., it is also known as Aluminothermy or Thermite process (Because mixture is known as Thermite).
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METALLURGY....
Not all metals are obtained directly from the nature, but pure metal is extracted from ore, this process is called Metallurgy. This involves many processes like:
Crushing the ore into small pieces.
Then, Concentrating the ore(ore-dressing).
Then, there is extraction of metal from the made concentrated ore in step-2)
Then, This is purified and refined to get the impurity free pure metal.
☃️ While in the third step, That is Extraction of metal from ore, it also includes two sub-steps for metals found in the middle of activity series:
Conversion into metal oxide
And then, Reduction of the metal oxide to metal.
➤ As in the question, Fe(Iron) is found in the middle of activity series, we follow the above two steps for its extraction from ore. This is also used in welding tracks.
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