Class 10 Science Chapter 3 Metals and Non-metals | Physical Properties Of Metals | Notes And Important Questions
NCERT class 10 Science chapter 3 is about metals and non-metals. Prepare for your class 10 science exam by reviewing our lessons, note and model question papers.
Notes
Based on their properties, elements can be classified as metals and non-metals
Physical Properties of metals
In their pure state, metals have a shining surface. This property is called metallic lustre.
Metals are hard and cannot be cut easily. The hardness varies from metal to metal.
Some metals are malleable. They can be beaten into thin sheets.
Some metals are ductile. That means they can be drawn into thin wires.
Metals are good conductors of heat. They have very high melting points.
Metals produce a sound when they strike a hard surface. Such metals are called sonorous.
One mark questions
1. Which are the most malleable metals?
Gold and silver
2. Which is the most ductile metal?
Gold
3. Which metals are the best conductors of heat?
Silver and copper
4. Which of the following is a good conductor of heat?
a) lead; b) mercury; c) silver
Answer: silver
5. Which is the only non-metal that exists in liquid form?
Bromine
6. Name the metal which exists as a liquid at room temperature.
Mercury
7. Which metals have the lowest melting point?
Gallium and caesium
8. Name a non-metal that is lustrous.
Iodine
9. Diamond is an ………………………. of carbon.
Allotrope
10. Which is the hardest natural substance?
Diamond
11. Name a non-metal that can conduct electricity?
Graphite
12. Graphite is an allotrope of ……………………….
Carbon
13. When non-metals dissolve in water, they produce ………………………. oxides.
Acidic
14. Name the metal which is a liquid at room temperature
Mercury
15. Name some metals which can be cut with a knife.
Lithium, sodium and potassium
16. Name a metal which is the best conductor of heat
Silver / copper
17. Name two metals which are poor conductors of heat.
Lead and mercury
18. Which metal burns in air with a white flame?
Magnesium
