Advertisements
Advertisements
प्रश्न
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
Advertisements
उत्तर
Elements: Gold and Diamond
Compounds: Common salt and marble
Mixtures: Brass and seawater.
APPEARS IN
संबंधित प्रश्न
Name the terms for the change of a solid into liquid.
Describe in your own words, what happens to the particles when salt dissolves in water.
What is meant by saying that metals are lustrous ?
What is the other name for impure substances ? Give two examples of impure substances.
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Define the emulsion. Give one example.
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
What is the general name of the process by which tea-leaves are separated from prepared tea ?
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
How will you separate a mixture of iron filings and powdered carbon ?
How is scrap iron separated from a heap of waste materials in factories?
One of the following does not undergo sublimation. This one is :
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Stars including Sun are covered in ______.
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
Give some examples of the Tyndall effect observed in your surroundings?
Define the term matter.
