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प्रश्न
Explain the following term:
Gangue
उत्तर
Ores contain metal compounds with some of the impurities like soil, sand, rocky material, etc. These impurities are called gangue.
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संबंधित प्रश्न
A student has been collecting silver coins and copper coins. One day she observed a black
coating on silver coins and a green coating on copper coins. Which chemical phenomenon is
responsible for these coatings? Write the names of black and green coatings.
Explain the following terms:
(c) slag
On which factors does the purification of metals depend?
`2NaNO_3`
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Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write three balanced equations for the purification of bauxite.
Explain with reason:
Why is powdered coke sprinkled on top of the electrolyte?
A compound that is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
The following is a sketch of an electrolytic cell used in the extraction of aluminium :
(a) What is the substance of which the electrode A and B are made?
(b) At which electrode (A or B) is aluminium formed?
(c) What are the two aluminium compounds in the electrolyte C?
(d) Why is it necessary for electrode B to be continuously replaced?
A process of extracting metals from aqueous solutions of their salts using suitable reducing agents is called ______
Explain the following term:
Metallurgy
