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प्रश्न
Which of the following is an ore of mercury metal?
(a) rock salt
(b) cinnabar
(c) calamine
(d) haematite
उत्तर
(b) cinnabar
Cinnabar is an important ore of mercury. Its compound is mercury (II) sulphide (HgS).
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संबंधित प्रश्न
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Give the principles of electromagnetic separation.
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
What is meant by refining of metals? Name the three common methods used for refining.
Explain the following:
Galvanization protects iron from rusting.
State three objectives achieved during the roasting of ores.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
In extraction of copper, the flux used is ____________.
