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What impurities are present in aluminium ore? - Science and Technology 1

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प्रश्न

What impurities are present in aluminium ore?

एक पंक्ति में उत्तर

उत्तर

Silica (SiO2), ferric oxide (Fe2O3) and titanium oxide (TiO2) are the impurities present in aluminium ore.

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2021-2022 (March) Set 1

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संबंधित प्रश्न

Aluminium is said to be more reactive than iron, towards oxygen (or air) yet iron undergoes corrosion to a greater extent than aluminum. Explain.


Give the chemical names and formulae of the main ores of zinc.


Both brass and bronze contain copper as major constituents. Name other elements in these alloys.


Name the constituents of Duralumin.


In order to obtain 1 tonne of aluminium, the following inputs are required: 4 tonnes 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 (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.

When bauxite is treated with sodium hydroxide solution, what happens to:

  1. the aluminium oxide,
  2. the iron (III) oxide?

In order to obtain 1 tonne of aluminium, the following inputs are required: 4 tonnes 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 (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.

  1. Name the process used for the purification of bauxite.
  2. Write the equation for the action of heat on aluminium hydroxide.

Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.

Name a chemical used for dissolving aluminium oxide. In which state is the chemical used?


In the Hall's process for extraction of aluminium, Give the formula and purpose of fluorspar and cryolite


Why is food containing iron salts should not be cooked in aluminium utensils?


Write balanced equation for the following reaction:
Aluminium powder is warmed with hot and concentrated caustic soda solution.


Aluminium is extracted from its chief ore bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Name a chemicals used for dissolving aluminium oxide. In which state of sub-division is the chemical used?


The following question relate to the extraction of aluminium by electrolysis.
Explain why is it necessary to renew the anode periodically.


Describe the role played in the extraction of aluminum:
Cryolite


Name the alloy used for the following purpose.

Aircraft


Answer the following question:

Write the chemical formula of one main ore of iron and aluminium.


The chief ore of Aluminium is ______


Write the balanced chemical equation to show the concentration of ore in Baeyer’s process.

Sodium aluminate to aluminium hydroxide


In Hall and Heroult's process, products liberated at anode and cathode are ______


State true or false.

Bauxite is the main ore of aluminium.


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