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प्रश्न
Explain the concept of Roasting.
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उत्तर
In roasting process, the sulphide ores are strongly heated in air to transform them into oxides. In this process, sulphide ores are oxidized to form metal oxides and sulphur dioxide gas.
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संबंधित प्रश्न
Define the Ore.
Name the most abundant metal in the earth's crust.
Name the gas in air which tarnishes silver articles slowly.
How is zinc extracted from its carbonate or (calamine)? Explain with equations.
Name two metals which occur in nature in free state as well as in combined state.
Name the gas produced when calamine ore is calcined.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Name the metal which is extracted from the ore called 'rock salt'.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
The two metals which are extracted by means of electrolytic reduction of their molten salts are:
(a) magnesium and manganese
(b) iron and aluminium
(c) zinc and magnesium
(d) magnesium and aluminium
Give the principles of the froth floatation process.
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Give the chemical formula of :
Sodium aluminate
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
What is meant by refining of metals? Name the three common methods used for refining.
Explain the following:
Galvanization protects iron from rusting.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Aluminium oxide is _______ oxide.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
