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
Fill in the blanks:
Metals react with acids to produce _________ gas.
State one use of Copper.
The atomic number of an element Y is 16.
(a) What must an atom of Y do to achieve the nearest inert gas electron arrangement?
(b) Which inert gas is nearest to Y?
Name an alloy of lead and tin.
Fill in the following blank with suitable word:
Brass is an alloy of copper and .........
What is an alloy? Give two examples of alloys.
Mention two uses of the following metals and non-metals
Oxygen
Give two uses of Germanium
Fill in the blank
_______ is a soft metal.
Statements given below are incorrect. Write the correct statements :
Aluminium is best conductor of electricity.
Write name.
The reagent that dissolves noble metals.
Write scientific reason.
Generally the ionic compounds have high melting points.
With reference to the following metals state their use in daily life metal:
Lead
The ability of metals to be drawn into thin wire is known as
Which one of the following metals do not react with cold as well as hot water?
Which one of the following four metals would be displaced from the solution of its salts by other three metals?
The electronic configurations of three elements X, Y and Z are X – 2, 8; Y – 2, 8, 7 and Z – 2, 8, 2. Which of the following is correct?
All gases are ______.
Match the following
| i. | Silica | a. | Caustic potash |
| ii. | Potassium hydroxide | b. | Sand |
| iii. | Sodium hydroxide | c. | Calamine |
| iv. | Zinc carbonate | d. | Caustic soda |
