In the concentration of galena by froth floatation method which of the following is used as a depressant?
Correct answer: C. NaCN
- A. NaOH
- B. CuSO4
- C. NaCN
- D. CaO
Explanation
Option C is correct. NaCN is used as a depressant in the concentration of galena by froth flotation method. In froth flotation, the ore is crushed and then mixed with a water-based solution that contains a surfactant. The ore particles are then air-floated, and the galena particles are collected while the other sulfide ores sink. NaCN forms a soluble complex with zinc ions, preventing them from attaching to the air bubbles, allowing galena to float to the surface.
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The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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