1. What is the role of pine oil in the froth flotation process?
A.
It acts as a frother
B.
It acts as a reducing agent
C.
It acts as a solvent for the ore
D.
It acts as a precipitating agent
Correct Answer:
It acts as a frother
Explanation:
Pine oil is added in the froth flotation process to produce and stabilize froth, which helps separate the ore particles.
2. In froth flotation, pine oil mainly helps the ore particles to become:
A.
Magnetic
B.
Attached to air bubbles
C.
Soluble in water
D.
Converted into metal
Correct Answer:
Attached to air bubbles
Explanation:
Pine oil helps form froth to which the sulphide ore particles attach and rise to the surface.
3. Pine oil is commonly used in the concentration of which type of ores?
A.
Sulphide ores
B.
Carbonate ores
C.
Oxide ores
D.
Halide ores
Correct Answer:
Sulphide ores
Explanation:
Pine oil is used as a frothing agent during the froth flotation concentration of sulphide ores.
4. Which property of pine oil is useful in froth flotation?
A.
It helps produce a stable froth
B.
It dissolves all gangue particles
C.
It changes the ore into an oxide
D.
It increases the density of water greatly
Correct Answer:
It helps produce a stable froth
Explanation:
Pine oil helps generate a stable froth that carries the ore particles to the surface for collection.
5. Where is pine oil added during froth flotation?
A.
Into the powdered ore and water mixture
B.
Into the molten metal
C.
Into the furnace after smelting
D.
Into the purified metal
Correct Answer:
Into the powdered ore and water mixture
Explanation:
Pine oil is added to the slurry containing powdered ore and water to form froth during concentration.
6. What is formed in the presence of pine oil during froth flotation?
A.
A layer of froth
B.
A layer of molten metal
C.
A layer of solid gangue
D.
A layer of crystalline salt
Correct Answer:
A layer of froth
Explanation:
Pine oil assists in forming a froth layer on the surface of the water in the flotation cell.
7. The froth produced with the help of pine oil is used to separate:
A.
Ore particles from gangue
B.
Metals from alloys
C.
Electrons from atoms
D.
Acids from bases
Correct Answer:
Ore particles from gangue
Explanation:
The froth flotation process uses pine oil to help separate sulphide ore particles from unwanted gangue.
8. Which substance is used as a frothing agent in froth flotation?
A.
Pine oil
B.
Sodium chloride
C.
Calcium carbonate
D.
Copper metal
Correct Answer:
Pine oil
Explanation:
Pine oil is a commonly used frothing agent in the concentration of sulphide ores by froth flotation.
9. Why is pine oil important in froth flotation?
A.
It helps the froth carry the ore particles upward
B.
It melts the ore at room temperature
C.
It converts gangue into a gas
D.
It removes all water from the ore
Correct Answer:
It helps the froth carry the ore particles upward
Explanation:
Pine oil helps create froth that carries the hydrophobic ore particles to the surface, enabling their separation.
10. Pine oil in froth flotation is best described as a:
A.
Frothing agent
B.
Flux
C.
Reducing agent
D.
Refining agent
Correct Answer:
Frothing agent
Explanation:
Pine oil is classified as a frothing agent because it produces and stabilizes the froth required for ore concentration.
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