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प्रश्न
Write the name.
The molecular formula of main ore of aluminium –
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उत्तर
The molecular formula of main ore of aluminium – Al2O3•nH2O
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संबंधित प्रश्न
What chemical process is used for obtaining a metal from its oxide?
Which of the following pairs will give displacement reactions?
Why do gold ornaments look new even after several years of use?
Define the term ore.
Define the terms gangue.
Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?
Which metal is extracted from calamine ore?
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
What is meant by refining of metals? Name the three common methods used for refining.
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Name the methods by which concentrated ore is converted to metallic oxide.
Name the process used for the enrichment of sulphide ore.
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
_______ is the least reactive metal.
Write the molecular formulae of the following compound.
Cryolite
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
Explain in brief types of extraction of less reactive metals according to their reactivity.
