Basic Oxides of Metals
A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
(a) Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved.
(b) Name the black substance formed and give its chemical formula.
Write a word equation for the reaction of magnesium with oxygen.
Classify Following Oxides As Neutral, Acidic, Basic Or Amphoteric:
On immersing an iron nail in CuSO4 solution for a few minutes, you will observe
No reaction takes place
The colour of the solution fades away
The surface of iron nails acquires a black coating
The colour of the solution changes to green