The flux used in the preparation of wrought iron from cast iron in a reverberatory furnace is

Write the chemical reactions taking place in the extraction of zinc from zinc blende.

Which statement is correct for roasting?

The mixture obtained from the roasting of copper pyrites is ......... .

The major products of the following reaction,$2ZnS_{(s)} + 3O_{2(g)} \xrightarrow{\text{Heat}} \dots$ are

Roasting of sulphides gives the gas $X$ as a byproduct. This is a colourless gas with a choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic,acts as a reducing agent,and its acid has never been isolated.
The gas $X$ is