Which of the following is used as a stabilizer during the concentration of sulphide ores?
(1) Pine oils          (2) Xanthates           (3) Fatty acids             (4) Cresols

Answer: Option 4
During the concentration of sulphide ores (such as galena (PbS), zinc blende (ZnS) etc), a suspension of the powdered ore is made with water, and collectors and froth stabilizers are added. Collectors such as pine oils, fatty acids, and xanthates are added to enhance the non-wettability of the mineral particles, while froth stabilizers such as cresols and aniline are added to stabilize the froth.
Cresols are a type of organic compound that are commonly used as froth stabilizers in the concentration of sulphide ores. They help to stabilize the froth by reducing the surface tension of the water and preventing the bubbles from bursting. This allows the mineral particles to be carried to the surface of the froth, where they can be skimmed off and dried for recovery.

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