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प्रश्न
Explain the following term:
Gangue
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उत्तर
Ores are composed of metal compounds and impurities such as soil, sand, and stony material. These contaminants are known as gangue.
संबंधित प्रश्न
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.
Give the effect of heat on their: hydroxide
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.
Name:
(b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen
Explain the following terms:
smelting
With a labelled diagram, explain the electro-refining of a particular metal.
`Ag2O`
................................
`MnO_2 + 4Al` 
…………….
`2NaNO_3`
......................
Give the ionization reactions of electrolyte used in Hall’s process. write the reaction at the cathode and the anode. Why the anode has to be replaced in this process?
Why is flux used in the blast furnace?
what does it form with silica present in the ore?
Explain with reason:
Why is powdered coke sprinkled on top of the electrolyte?
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?
Cassiterite is a copper ore.
Write the molecular formulae of the following compound.
Ferrous tungstate
Complete the following flowchart.
Limestone is used as a flux in the extraction of ______.
In leaching of alumina from bauxite by Bayer's process, then ore is treated with ______.
Calcination is used in metallurgy for the removal of?
