How is hydrogen sulphide prepared?

How is hydrogen chloride prepared? Write its uses.

How is hydrogen peroxide prepared in the laboratory?

How is hydrogen peroxide prepared by electrolytic process?

How hydrogen chloride is prepared in the laboratory ?

How a colloidal sol of arsenous sulphide is prepared ?

Acidified potassium dichromate is treated with hydrogen sulphide. In the reaction the oxidation number of chromium

Turbidity is obtained when hydrogen sulphide is passed through aqueous solution of sulphur dioxide. Explain.

Comment on the sability of hydrogen sulphide and polysulphides.

Sulphuric acid oxidises hydroiodic acid to iodine and forms hydrogen sulphide and water.