Advertisements
Advertisements
Question
Write scientific reason.
Pine oil is used in froth flotation.
Solution
- 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.
RELATED QUESTIONS
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Sodium is a very reactive metal. ( )
Fill in the following blanks with suitable words:
A metal having low melting point is ..................... but a non-metal having very high melting point is ..............
State one use of Copper.
State one use of Aluminium.
The atomic number of an element X is 12.
(a) What must an atom of X do to attain the nearest inert gas electron configuration?
(b) Which inert gas is nearest to X?
How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper?
What is meant by 22 carat gold? Name the metals which are usually alloyed with gold to make it harder.
Give reasons
Magnesium is used in fire works.
Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride
______ is a liquid metal.
Statements given below are incorrect. Write the correct statements :
Zinc is used for making power transmission wires.
Name a metal which is best conductor of electricity :
State two important uses of following metal
Uses of copper
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Oxygen
Why are alkali metals kept in kerosene oil?
State why telegraph poles are painted with aluminium paint.
Electronic configuration of metal A is 2,8,1. Electronic configuration of metal B is 2,8,8,2. Which of the above metals is more reactive? Explain with reason.
The metal which is liquid at room temperature is ______.
Which of the following two combinations are correct?
Metal | Gas Evolved | |
(i) | Copper | Yes |
(ii) | Iron | Yes |
(iii) | Magnesium | No |
(iv) | Zinc | Yes |
______ is the first scientist who used the term element.