Which ore is concentrated by froth flotation process?
A. Magnetite
B. Galena
C. Carnallite
D. Bauxite
Answer: Option B
Solution (By JKSSB Mock Tests)
Froth flotation is used to concentrate sulfide ores. Galena (PbS) is a sulfide ore; it is wetted by oil (pine oil) and comes to the surface with froth, while gangue particles wetted by water settle down. Bauxite (Al₂O₃·2H₂O) is an oxide ore concentrated by leaching (Bayer's process). Magnetite (Fe₃O₄) is magnetic ore separated by magnetic separation. Carnallite (KCl·MgCl₂·6H₂O) is a halide ore.
Explanation:
Rutherford's experiment led to the nuclear model of the atom, concluding that almost all the mass and positive charge are concentrated in a very small central nucleus, while electrons orbit around it. Option B is Thomson's model, A is Bohr's model, and D is de Broglie's concept.
Explanation:
Fermentation is the anaerobic breakdown of glucose by enzymes (zymase) in yeast to produce ethanol and CO₂: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. Esterification forms esters, saponification makes soap, hydrogenation adds H₂.
Explanation:
Chlorine forms hypochlorous acid (HOCl) which is a strong oxidizing agent that destroys bacteria and viruses. It does not remove particles (filtration does) or dissolved salts.
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