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प्रश्न
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 ?
उत्तर
- Group of materials P is element.
- Q is a non-metal. Examples: Carbon(s), and bromine (l)
- R is a metal, as most of them are good conductors of heat and electricity. Examples: Copper, and aluminum
- S is a metalloid, as they have intermediate properties of those of metals and non-metals. Examples: Arsenic, and antimony
- R is a metal, therefore, it is malleable and ductile.
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