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प्रश्न
Name the following:
Main ore of aluminium.
Name the ore for aluminium.
Give one word for the following:
An ore of aluminium.
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उत्तर
Bauxite (Al2O3.nH2O) is the main ore of aluminium.
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संबंधित प्रश्न
Name two metals which are found in nature in the free state.
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Name one metal which is extracted by:
Reduction with aluminium.
Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Which metal is extracted from bauxite ore?
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
The metal which can be extracted simply by heating the cinnabar ore in air is ______.
Give the principles of the froth floatation process.
Give reasons, why aluminum is used in:
wrapping chocolates
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
Define the following term.
Gangue
Name the following:
The substance added to get rid of gangue in the extraction of metal.
Define the term:
Slag
How are metals refined by the electrolytic methods?
What is passive iron?
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Name : The metal which is liquid at room temperature.
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
State three objectives achieved during the roasting of ores.
Zinc blende is converted to oxide by ______ process.
Aluminium oxide is _______ oxide.
_______ is the least reactive metal.
Find the odd one out and give its explanation.
Write the name.
The molecular formula of main ore of aluminium -
Mercury, silver, gold are highly reactive metals.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Right or wrong sentence?
In the electrolytic dissipation method of alumina, the lining of graphite acts as an anode.
Explain the characteristics of ionic compounds.
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
