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प्रश्न
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
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उत्तर
All the elements can be divided into following three groups:
- Metals: Examples: Aluminium and copper
- Non-metals: Examples: Potassium and calcium
- Metalloids: Examples: Arsenic and antimony
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संबंधित प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Which one is a kind of matter:
All kinds of matter
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
The best evidence for the existence and movement of particles in liquids was provided by :
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Name a non-metal which is a good conductor of electricity.
Which type of elements, metals or non-metals, show the property of brittleness ?
What is meant by saying that metals are malleable and ductile?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Define Sol and give one example.
What is a suspension ? Give two examples of suspensions.
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
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.
The boiling point of liquid argon is :
Wipe the board with a duster and then tap the duster against the table. What do you see?
Which among the following ______ will get attracted to by magnet?
