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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
Which one is a kind of matter:
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Name a liquid which can be classified as a pure substance and conducts electricity.
Name one solid, one liquid and one gaseous non-metal.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Give reason why copper metal is used for making electric wires.
Give reason why graphite is used for making elecrode in a dry cell.
How would you confirm that a colourless liquid given to your is pure water ?
What is the most common way of expressing the concentration of a solution ?
State whether the following statement is true or false :
Bread is an example of solid foam.
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..............
Fill in the following blanks with suitable words :
If a mixture contains iron filings as one of the constituents, it can be separated by using a .......................
How will you separate a mixture of common salt, sulphur powder and sand ?
If there is a sudden shower, we take shelter under a roof at the roadside. Even though the rain does not fall on us directly, we get wet to some extent. Why ?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
All the matter made of ______.
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
The most reactive metal is ______.
Solids possess very high kinetic energy.
