SEBA Class 7 Science Important Chapter 8 Concept of Metals and Non – Metals

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SEBA Class 7 Science Important Chapter 8 Concept of Metals and Non – Metals

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Concept of Metals and Non – Metals

Chapter: 8

PART – II

IMPORTANT QUESTION ANSWER

Short Type Question and Answer:

1. What is metallic lustre? 

Ans: Metals reflect light from their surface, which gives them a shiny appearance known as metallic lustre.

2. Define malleability. 

Ans: Malleability is the property of metals that allows them to be beaten into thin sheets without breaking.

3. Name the only metal that is liquid at room temperature. 

Ans: Mercury is a liquid metal at room temperature, commonly seen in laboratory thermometers.

4. What is ductility? 

Ans: Ductility is the property of materials, primarily metals, that allows them to be drawn into long wires without breaking.

5. Which metal is considered the most ductile? 

Ans: Gold is the most ductile metal; a single gram of gold can be stretched into a wire over two kilometers long.

6. What does it mean for a substance to be sonorous? 

Ans: A substance is sonorous if it produces a ringing sound when struck, a property typical of metals.

7. Why is graphite unique among non-metals? 

Ans: Although graphite is a non-metal made of carbon, it is a good conductor of electricity, which is an exception for its class.

8. What is an element? 

Ans: An element is a fundamental unit of matter that cannot be divided into smaller components.

9. Define corrosion. 

Ans: Corrosion is the gradual deterioration of metal surfaces caused by exposure to air, water, or other environmental substances.

10. Who is known as the “father of modern chemistry”? 

Ans: Antoine Lavoisier is known as the father of modern chemistry for his work in classifying elements based on observable properties.

Fill in the Blanks:

1. The property by which metals can be beaten into thin sheets is called____________.

Ans: Malleability.

2. _________ is the hardest known substance and is a form of carbon.

Ans: Diamond.

3. The process of depositing a layer of zinc on iron to prevent rusting is called__________.

Ans: Galvanization.

4. Non-metal oxides are generally ________ in nature.

Ans: Acidic.

5. _______________ is a non-metal whose solution is used as an antiseptic on wounds.

Ans: Iodine.

True or False:

1. Sodium and potassium are hard metals that cannot be cut with a knife. 

Ans: False, They are actually soft metals.

2. Metals are said to be sonorous because they produce a ringing sound when struck.

Ans: True

3. Rusting of iron takes place only in the presence of dry air. 

Ans: False, It requires both air and water.

4. Graphite, though a non-metal, is a conductor of electricity.

Ans: True.

5. Generally, non-metals do not react with water.

Ans: True.

Match the following:

Column I	Column II
1. Gold	(a) Stored in water to prevent catching fire
2. Phosphorus	(b) Used in water purification
3. Iron Pillar of Delhi	(c) Most ductile metal
4. Bell Metal	(d) Famous for resistance to corrosion
5. Chlorine	(e) Used for making school bells and cymbals

Ans: 

Column I	Column II
1. Gold	(c) Most ductile metal
2. Phosphorus	(a) Stored in water to prevent catching fire
3. Iron Pillar of Delhi	(d) Famous for resistance to corrosion
4. Bell Metal	(e) Used for making school bells and cymbals
5. Chlorine	(b) Used in water purification