Why aluminum alloys are used to design the body of an aircraft? Give reasons.

Why are alloys commonly used in electrical heating devices give reasons?

Give reasons, why aluminum is used in :

(a) making alloys,

(b) Wrapping chocolates,

(c) Painting electric and telegraphic poles,

(d) In aluminiothermy,

(e) In making ships.

Give reasons:

(i) Conc. HNO₃ can be transported in aluminium container.

(ii) A mixture of dilute NaOH and aluminium pieces is used to open drain.

(iii) Graphite is used as lubricant.

(iv) Diamond is used as an abrasive.

(v) Aluminium alloys are used to make aircraft body.

(vi) Aluminium utensils should not be kept in water overnight.

(vii) Aluminium wire is used to make transmission cables.