Advertisements
Advertisements
प्रश्न
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
उत्तर
- Metals: Metals are elements that are malleable, ductile and conduct electricity.
Examples: Aluminum and zinc - Non-metals: Non-metals are elements that are neither malleable nor ductile, and they do not conduct electricity. Most non-metals are brittle in nature.
Examples: Phosphorus, hydrogen - Metalloids: Metalloids are elements that show properties of both metals and non metals.
Examples: Germanium, silicon
APPEARS IN
संबंधित प्रश्न
Match the following
Column A | Column B | ||
(a) | Molecules | (i) | Water boils |
(b) | 100° C | (ii) | Evaporation |
(c) | 0° C | (iii) | Changes from solid to gas |
(d) | At all temperatures | (iv) | Matter |
(e) | Camphor | (v) | Water freezes |
The molecules can move freely anywhere in
Liquids have definite shape and definite volume.
Name the terms for the change of vapour into a liquid.
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Name two solid, two liquid and two gaseous elements at the room temperature.
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
How will you differentiate between a suspension and a colloid ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Describe a method to separate a mixture of camphor and sand.
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
______ is a smallest particle.
A standard sheet of paper is about ______ of atoms thick
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
(A) | (B) | ||
(a) | degree celsius | (i) | kilogram |
(b) | centimetre | (ii) | pascal |
(c) | gram per centimetre cube | (iii) | metre |
(d) | bar | (iv) | kelvin |
(e) | milligram | (v) | kilogram per metre cube |
Liquids cannot be compressed and they have fixed volume.
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
Which statement is not correct for a mixture
Define the term matter.