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प्रश्न
Which of the following statements are correct?
(i) A depressant prevents certain type of particle to come to the froth.
(ii) Copper matte contains \[\ce{Cu2S}\] and \[\ce{ZnS}\].
(iii) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of \[\ce{SO2}\] during the extraction.
(iv) Zinc can be extracted by self-reduction.
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उत्तर
(i) A depressant prevents certain type of particle to come to the froth.
(iii) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of \[\ce{SO2}\] during the extraction.
Explanation:
Depressants can prevent frothing of a particular sulphide. The solidified copper obtained in reverberatory furnace has blistered appearance hence it is called blister copper.
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संबंधित प्रश्न
Select the process from the following which matches the given description.
(calcination, roasting, pulverisation, smelting)
Crushing of the ore into a fine powder.
State the main components of the following alloys:
Bronze
Name an ore of zinc.
Which process is applied to concentrate ore of zinc?
Give three ways in which the metal zinc differs from the non-metals carbon. At least one of the differences must be a chemical difference?
Name the following:
The rocky impurities present in an ore.
Give reason for the following:
Zinc is used in galvanization and dry cells.
Define the term : Mineral
Name the process of concentration
(a) Based on densities
(b) Based on magnetic nature.
Name one metal occurring as a : Sulphide ore
What is an alloy?
Give composition and uses of the following alloys. Mention the reason for its use.
Duralumin
Complete and balance the following equation:
Al + O2 →
Complete and balance the following equation:
Fe2O3 + CO →
Complete and balance the following equation :
Al + NaOH →
Name a metal which occurs free in nature.
Give the name and formula of an ore of zinc.
Reduction of the zinc compound which is the product of above reaction.
The following question refer to the extraction of aluminium and iron from their ores:
What is the most important chemical process in the extraction of any metal? State how this essential step is carried out in the extraction of: i. iron, and ii. Aluminium.
The metals zinc and tin are present in the alloy
The main ore used for the extraction of iron is ______.
