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4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(a) When bauxite is treated with sodium hydroxide solution, what happens to:
(i) the aluminium oxide?
(ii) The iron (III) oxide?
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In order to obtain one tone of aluminium, the following inputs are required:
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(i) Write the formula of cryolite.
(ii) Write down the word which correctly completes the following sentence.
"By dissolving aluminium oxide in cryolite, a ______ (conducting / non- conducting) solution is produced.
(iii) Why so much graphite required for this electrolytic process.
(iv) Write the equation for the reaction which takes place at cathode.
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Name the following:
The compound formed by the reaction between calcium oxide and silica.
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Answer the following question :
Name the process used for the enrichment of sulphide ore.
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Name the following :
A metal oxide that can be reduced by hydrogen
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Answer the following question with respect by hydrogen : Identify the components of the electrolyte other than pure alumina and the role played by each.
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Answer the following question with respect by hydrogen :
Explain why powdered coke is sprinkled over than electrolytic mixture.
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Complete the following by selecting the correct option from the choices given :
The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction ________
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Complete the following by selecting the correct option from the choices given :
The diavalent metal whose oxide is reduced to metal by electrolysis of its fused salt is ________
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Name the following:
Gas that yields white precipitates dense white fumes when mixed with hydrogen chloride.
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Name the following:
A chloride which is soluble in excess of ammonium hydroxide.
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Name a chloride which is soluble in excess of ammonium hydroxide.
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Name the process used to manufacture ammonia from its elements.
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Explain the following:
The source of heat is removed after sometime in Haber's process.
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Explain the following:
Dry N2 and H2 must be used in the Haber's process.
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Explain the following:
A promoter is added along with the catalyst in the Haber's process.
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The questions below are related to the manufacture of ammonia.
(i) Name the process
(ii) In what ratio must the reactants be taken
(iii) Name the catalyst used
(iv) Give the equation for the manufacture of ammonia
(v) Ammonia can act as a reducing agent write a relevant equation for such a reaction.
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What will you observe, when hydrogen chlorides mixed with ammonia?
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