Question

The Liquor process is used for the concentration of which ore?
$
  {\text{A}}{\text{. Stibnite}} \\
  {\text{B}}{\text{. Tinstone}} \\
  {\text{C}}{\text{. Limestone}} \\
  {\text{D}}{\text{. Haematite}} \\
$

Answer 1

Hint: The definition of the process liquation which is used to extract metals should be known and also the specific minerals for which it is conducted.

Complete step-by-step answer:

Liquation is a metallurgical method for separating metals from their ore or alloy. The material must be heated until one of the metals starts to melt and drain away from the other and can be collected.
Metals that have particularly low melting points can be refined by using the liquation method which includes metals like tin and ores of tin. In this method a low melting metal which is associated with high melting impurities like tin. The impure metal is heated on a sloping hearth of a furnace. The pure metal flows down leaving behind the non-fusible material on the hearth.
Tinstone which is also known as Cassiterite and the formula of which is $SnO_2$, the metal tin can be extracted by this method as it has a low melting point of 449.5 degrees Fahrenheit or 231.9 degrees Celsius which is comparatively lower in comparison to other metals , so the process of liquation is suitable for the extraction of tin from its ores.
In order to extract tin from its minerals, we require very high temperatures.
Tin is obtained by reducing the ore tinstone with coal in a reverberatory furnace and limestone is added to it to produce a slag with the impurities present in tinstone, which can be separated.

                      SnO+2C⟶Sn+2CO

Crude tin obtained is contaminated with iron, copper, lead and other metals and therefore, reeled on an inclined furnace. This process is called liquation.
The easily fusible tin melts away and the less fusible impurities are left behind. Molten tin is finally stirred with green poles of wood in contact with air. In this process, any remaining metal impurities are oxidized forming a scum, which rises to the surface and is removed.
The correct option is (B).

Note: To do this question it is important to know about different processes by which metals can be extracted. Each and every point in the metallurgy chapter is important.