Extraction of Crude Metals from Concentrated Ores

Extraction of zinc from zinc blende is achieved by

Roasting is carried out to _____

Sulphide ore on roasting gives a gas $\mathrm{X}$. $\mathrm{X}$ reacts with ${\mathrm{Cl}}_2$ in the presence of activated charcoal to give $\mathrm{Y}$. $\mathrm{Y}$ is :

Which of the following equations represents calcination ?

Give name of furnace used for calcination?

Roasting of sulphides gives the gas $\mathrm{X}$ as a by-product. This is a colourless gas with 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 $\mathrm{X}$ is

Heating of iron pyrites in air to remove sulphur is called 

Which of the following statements are correct?

Give details (with examples) of the calcination and Roasting. Also mention the difference between them.

What is calcination? Write examples with reactions.

Explain the term: Calcination.

Explain the term:

Roasting.

What is calcination.

Among the following, how many ores are roasted to convert them into their corresponding metal oxides, alumina, zinc blende, iron pyrites, copper pyrites, galena.

Sometimes roasting may not bring about complete oxidation:

 $2{\mathrm{CuFeS}}_2+4{\mathrm{O}}_2\to \mathrm{A}+2\mathrm{FeO}+3{\mathrm{SO}}_2$ 

Find out $\mathrm{A}$

$2\mathrm{PbS}+3{\mathrm{O}}_2\to \mathrm{A}+2{\mathrm{SO}}_2$

The name of $\mathrm{A}$  is

Select the correct statement:

The reaction that does not define calcination is

Roasted copper pyrite on smelting with sand produces

Heating a mixture of $C{u}_{2}O$ and $C{u}_{2}S$ will give