Give reasons for the following : (i) ...

Give reasons for the following :
(i) Carbonate and sulphide ores are converted into oxides before reduction.
(ii) Aluminium is rendered passive when it is dipped in conc. `HNO_(3)`
(iii) Nonmetals do not displace hydrogen from acids.
(iv) An aqueous solution of ` CuSO_(4)` cannot be stored in an iron vessel.
(v) The surface of some metals become dull when left exposed to air for a long time.

Similar Questions

Explore conceptually related problems

Why are sulphide ores converted to oxide before reduction?

Explain why the surfaces of some metals become dull when exposed to air for sometime.

Why are sulphide ores converted to oxide form before reduction to metal ?

Give reason for the following: Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.

A sulphide ore is first converted into its oxide before reduction. This is done because :

Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.