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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.
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
What is the scientific name of particles which make up mater?
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
On the basis of composition of matter, milk is considered to be :
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
- What could the group of materials P be ?
- Name the substances Q. Give two examples of such substances.
- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
- Out of Q, R and S, which substances are malleable and ductile ?
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Define solute.
What is meant by the concentration of a solution ?
Which of the following is not an emulsion ?
Which of the following can be called a suspension ?
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
How will you separate camphor, common salt and iron nails from their mixture ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
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 movement of particles in liquids is ______.
A teabag placed in a cup of hot water will diffuse into the water.
Gas-solid is ______.
Evaporation is always accompanied by ______ in temperature.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
