Advertisements
Advertisements
प्रश्न
Write scientific reason.
Pine oil is used in froth flotation.
उत्तर
- Pine oil is hydrophobic.
- The particles of the metal sulphide ores which are hydrophobic get wetted by pine oil.
- They float with the foam on the surface of water.
- Thus, by using this property some ores which contain hydrophobic particles in them can be concentrated by froth floatation process.
Hence, pine oil is used in froth floatation.
संबंधित प्रश्न
Give a reason for Alkali metals are good reducing agents.
State one use of Copper.
What elements are present in steel? How are the properties of steel different from those of pure iron?
How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper?
Mention two uses of the following metals and non-metals
Gold
Mention two uses of the following metals and non-metals
Iodine
A metal with melting point less than 50°C is
Statements given below are incorrect. Write the correct statements :
Aluminium is best conductor of electricity.
State two important uses of following metal
Uses of zinc
Why are alkali metals kept in kerosene oil?
Write name.
The oxide that forms salt and water by reacting with both acid and base.
Write name.
The reagent that dissolves noble metals.
Write scientific reason.
Generally the ionic compounds have high melting points.
Write scientific reason.
Sodium is always kept in kerosene.
Name two soft metals which can be cut with a knife.
Why are bells made of metals?
A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron. Explain.
All gases are ______.
Sodium is a hard metal.
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
______ is the reducing agent.
