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प्रश्न
Aluminium oxide is _______ oxide.
पर्याय
acidic
basic
neutral
amphoteric
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उत्तर
Aluminium oxide is amphoteric oxide.
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संबंधित प्रश्न
Give a reason for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.
Why does aluminium not corrode right through?
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Define the terms gangue.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Name three other metals which are extracted in a manner similar to sodium.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
Give reasons, why aluminum is used in:
making alloys
Aluminum is used in thermite welding:
what is ignition mixture?
What is meant by refining of metals? Name the three common methods used for refining.
Usually ______ ores are subjected to ______ which is done in the absence of air.
Atomic number of aluminium is _______ and its electronic configuration is _______.
Sulphide ores : Roasting : : Carbonate ores : _______
Write the name.
Metals which are amphoteric in nature.
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
Care must be taken while diluting concentrated nitric acid with water. Why?
