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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
Which of the following pairs will give displacement reactions?
Name the following:
The property possessed by metals by which they can be beaten into sheets.
The process by which sulphide ore is concentrated.
Name two metals which are highly resistant to corrosion.
What is the difference between a mineral and an ore?
The metal which can be extracted from pyrolusite ore is ______.
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
- Name the metal X.
- Name the metal oxide XO2.
- Which reducing agent can be used to reduce XO2 to obtain metal X?
- Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Give the principles of the hydrolytic method.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
Aluminum is used in thermite welding:
what is ignition mixture?
Name:
The allotrope of the non-metal carbon which conducts electricity.
Which one of the following is not true of metal :
Metals are malleable and ductile
Name the following:
A steel grey coloured solid non-metal.
Zinc sulphide : Roasting : : zinc carbonate : _______
Mercury, silver, gold are highly reactive metals.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
