Advertisements
Advertisements
प्रश्न
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
Advertisements
उत्तर
| Compounds | Elements |
| H2O, CO | He, Co, Cl2 |
APPEARS IN
संबंधित प्रश्न
What is the scientific name of particles which make up mater?
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
Define matter. Give four examples of matter.
Name a non-metal which is a good conductor of electricity.
Name the property which allows metals to be hammered into thin sheets.
Which type of elements, metals or non-metals, show the property of brittleness ?
What are the two types of pure substances? Give one example of each type.
State any two properties for believing that aluminium is a metal.
Give reason why copper metal is used for making electric wires.
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
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Name the different types of solutions. Give one example of each.
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Which one of the following scrap metal cannot be separated by magnetic separation ?
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
Higher the temperature, the higher the kinetic energy of particles.
The fluidity of solids: ______.
