Question

Explain why:
(i) Conc. HNO3 can be stored in aluminium container.
(ii) Aluminium is used for making transmission wires.
(iii) 24 carat gold can not be used for making ornaments.
(iv) Aluminium is used for making cooking utensils.
(v) Metals generally do not form compounds with hydrogen.

Answer 1

Explanation:

vii) Aluminium wire is used to make transmission cables. (i) Concentrated HNO3 can be stored and transported in aluminium containers as it reacts with aluminium to form a thin protective oxide layer on the aluminium surface. This oxide layer renders aluminium passive.