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प्रश्न
Define roasting.
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उत्तर
Roasting is the process of heating concentrated ore to a high temperature in the presence of air. The process is usually carried out for sulphide ores.
संबंधित प्रश्न
Name the following:
The property possessed by metals by which they can be beaten into sheets.
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Name one metal which is extracted by:
Reduction with carbon.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Name the method by which aluminium metal is extracted.
Give the name and chemical formula of one ore of copper.
Name two metals which occur in nature in free state as well as in combined state.
Define the term ore.
Explain giving equation, what happens when:
ZnCO3 is heated in the absence of air?
Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?
What iron compound is present in haematite ore? Also write its chemical formula.
Which of the following metals can be obtained from haematite ore?
State three objectives achieved during the roasting of ores.
Give the principles of the hydrolytic method.
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Define the term:
Flux
Compare the process of calcination and roasting.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Answer the following question :
What is the difference between calcination and roasting.
State three objectives achieved during the roasting of ores.
Find the odd one out and give its explanation.
Write the name.
Metals which are amphoteric in nature.
Mercury, silver, gold are highly reactive metals.
Complete flow chart given below.
Explain in brief types of extraction of highly reactive metals according to their reactivity.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
