Precipitation of second group sulphides in qualitative analysis is carried out with `H_(2)S` in presence of `HCl` and nitric acid.Why?

Precipitation of second group sulphides in qualitative analysis is carried out with H_(2)S in presence of HCl and not nitric acid.Why?

Explain i) ozone layer acts as an umbrella for the earth against the harmful radiation from sun. ii) The wooden shelf under thé reagent bottle containing conc. H_2 SO_4 blackens after sometime. iii Precipitation of secònd group sulphides in qualitative analysis is càrried out with H_2 S in presence of HCl and not nitric acid.

The precipitation of second group sulphides qualitative analysis is carried out with hydrogen sulphide in the presence of hydrochloric acid but not with nitric acid .Explain.

The ion not precipitated by H_(2)S in presence of HCl is :

In the second group of qualitative analysis, H_(2)S is passed through a solution acidified with HCl in order to

In the precipitation of group III in qualitative analysis ammonium chloride is added before adding NH_4OH to :

In the second group of qualitative analysis, H_(2)S is pass through a solution acidified with HCl in order to :