Advertisements
Advertisements
प्रश्न
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
Advertisements
उत्तर
We would obtain sodium chloride from a mixture of sodium chloride and sulphur by using carbon disulphide as a solvent instead of water. Sulphur is soluble in carbon disulphide, whereas sodium chloride is not. So, we can mix sulphur and sodium chloride in carbon disulphide as all the sulphur will get dissolved and sodium chloride will remain insoluble. Then, sodium chloride can be obtained from the mixture by filtration, where it would be obtained as a residue.
APPEARS IN
संबंधित प्रश्न
Intermolecular space is maximum in .......... less in ............ and the least in .........
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
Name the property which enables metals to be drawn into wires.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
Tincture of iodine has antiseptic properties. This solution is made by dissolving :
Name the process by which common salt is purified.
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
Write a method to separate a mixture of sand and potash alum.
How will you separate water from mustard oil ?
Explain how, impure copper sulphate can be purified by crystallisation.
The property which allows the metals to be hammered into their sheets is ______.
Name the metals that are used in jewellery.
The fluidity of solids: ______.
Give an example of liquid in gas.
Define the term matter.
