Answer:
(i) Al
becomes passive in cone. \[HN{{O}_{3}}\]. A thin film of oxide is formed on its
surface which prevents further action of\[HN{{O}_{3}}\]. Hence, containers of passive
aluminium can be safely used for transporting conc. \[HN{{O}_{3}}\].
(ii) Graphite has a layered structure in which various layers
are held by van der Waals' forces. These layers can be made to slip over one
another.
Therefore, graphite acts as a lubricant.
(iii) On account of hardness of diamond, it is used as an abrasive.
(iv) \[NaOH\]reacts with Al and produces hydrogen. The pressure
of the released hydrogen can be used to open the clogged drains.
(v) Al alloys are light and corrosion resistant. These are tough
and hence are used to make aircraft body.
(vi) Aluminium is slowly attacked by water and dissolves
oxygen to form \[A{{l}_{2}}{{O}_{3}}\] on the surface. A very very small amount
of\[A{{l}_{2}}{{O}_{3}}\]may dissolve to give a few \[A{{l}^{3+}}\] ions.
Since, \[A{{l}^{3+}}\] ions are injurious to health, the drinking water should
not be kept in aluminium vessels for long.
(vii) Al is a good conductor of electricity and is also not
affected by atmosphere. Hence, it is used in transmission cables.
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