Question

In the bessemerisation of sulphide ore of copper, there is self-reduction giving copper metal.
If true enter 1, else enter 0.

Answer 1

Hint: We should know that in the extraction process of copper from the sulphide ore there is no external agent used in the process. So we need to have an idea about the various steps that are followed in the bessemerisation of sulphide ore of copper.

Step by step answer:
In the bessemerisation of sulphide ore of copper, the process involves the following steps:
1. The sulphide ore of copper is heated in the air until a part is converted to oxide.
2. Then further heating is done in the absence of air to let the oxide react with unchanged sulphide.
3. Then the self-reduction of C$u_2$S to Cu is carried out either in Bessemer converter or Pierce-Smith converter.
Here are the equations which are involved in the process:

$2C{{u}_{2}}S+3{{O}_{2}}\to 2C{{u}_{2}}O+2S{{O}_{2}}$
$2C{{u}_{2}}O+C{{u}_{2}}S\to 6Cu+S{{O}_{2}}$

Thus we can say that yes, the bessemerisation of sulphide ore of copper, there is self-reduction giving copper metal.
So we have to enter 1.

Additional Information: Bessemerisation is a process of conversion used in metallic as in formation of metallic copper and it is generally used to convert coal and pig iron into steel.

Reduction to free metal: Some of the methods commonly used to get free metals from the concentrates ores are below:
1. Smelting: The process of extracting a metal in the state of fusions is called smelting. In this process the ore is mixed with carbon and heated in a suitable furnace.
2. Electrolytic reduction process: This process is used in the extraction of the alkali and alkaline earth metals like zinc and Aluminium.
3. Self-reduction process: The sulphide ores of less electropositive metals like lead, copper etc. are heated in air so as to convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal.

Note: The commonest ore used in the extraction of copper is Chalcopyrite also known as Copper Pyrites and other such sulfides. The percentage of copper in the actual ore is too low for direct extraction of copper to be viable. The concentration of ore is required and it is done by the Froth Flotation method.
At present Chalcopyrite accounts for about 50% of copper production.