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प्रश्न
Why does aluminium not corrode right through?
उत्तर
Aluminium is a highly reactive metal. It reacts easily with oxygen in the air and forms a layer of aluminium oxide on its surface. This layer is very tough and does not allow air to enter the metal for further reaction. This prevents aluminium from further corrosion. Thus, aluminium articles become unreactive toward air and water and do not corrode easily due to the presence of strong aluminium oxide layer on it. Hence, aluminium is highly resistive to corrosion.
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संबंधित प्रश्न
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
Give reasons, why aluminum is used in:
making alloys
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
Name the methods by which concentrated ore is converted to metallic oxide.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Find the odd one out and give its explanation.
Explain the characteristics of ionic compounds.
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
