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प्रश्न
Name the following:
Main ore of aluminium.
Name the ore for aluminium.
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उत्तर
Bauxite (Al2O3.nH2O) is the main ore of aluminium.
संबंधित प्रश्न
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Name two metals which are found in nature mainly in the free state (as metallic elements).
Name the metal which is extracted from haematite ore.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Which metal is extracted from calamine ore?
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
Which metal can be extracted from the following ore?
bauxite
State three objectives achieved during the roasting of ores.
Give the principles of electromagnetic separation.
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Give reasons, why aluminum is used in:
In aluminiothermy
Aluminum is used in thermite welding:
what is thermit?
Aluminum is used in thermite welding:
write reaction for process?
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 concentration of ores?
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
State three objectives achieved during the roasting of ores.
Define calcination.
Usually ______ ores are subjected to ______ which is done in the absence of air.
Name the process used for the enrichment of sulphide ore.
Answer the following question:
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
Atomic number of aluminium is _______ and its electronic configuration is _______.
Sulphide ores : Roasting : : Carbonate ores : _______
Find the odd one out and give its explanation.
Find the odd one out and give its explanation.
Write the name.
The molecular formula of main ore of aluminium –
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain the reactions of nonmetals with water with the help of examples.
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
An alloy is
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.
