Advertisements
Advertisements
प्रश्न
Write a method to separate a mixture of sand and potash alum.
Advertisements
उत्तर
A mixture of sand and potash alum is separated by filtration followed by evaporation. The mixture contains two constituents, i.e., potash alum and sand.
Mix both the constituents thoroughly with water so that potash alum gets dissolved in water. However, sand, being insoluble in water, will not get dissolved in it. On filtering the liquid, the solid that is left behind will be the sand, and the liquid will be a solution of potash alum. Potash alum can now be re-crystallized by heating the solution gently. In the process, all the water gets evaporated leaving behind potash alum.
APPEARS IN
संबंधित प्रश्न
What is meant by saying that non-metals are brittle ?
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
What are pure substances ? Give two examples of pure substances.
What are the two types of pure substances? Give one example of each type.
Which of the following is not an element ?
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
Out of a colloid, solution and a suspension :
which one has the largest particles ?
What happens when the temperature of a saturated sugar solution is increased ?
State whether the following statement is true or false :
Sponge is an example of solid sol.
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
What is chromatography ? State its two applications.
Liquids have ______.
Solid is an arrangement of particles ______.
Compressibility of solids: ______.
