Ch 3 METALS AND NON METALS

Question 1

Name Some Physical Properties of Metals.

Answer 1

•Metals are Shiny they have metallic Lustre.
•They are Malleable and Ductile
•They can Conduct Electricity
•They have high melting point
•They are Sonorous

Question 2

Name the Metals which are Poor Conductors of heat.

Answer 2

Lead
Mercury

Question 3

Name the metals which are best conductors of heat.

Answer 3

Silver
Copper

Question 4

Full form of PVC?

Answer 4

Polyvinylchloride

Question 5

Which Metal exists in liquid form at Room temperature?

Answer 5

Mercury

Question 6

Name metals with very low melting point?

Answer 6

They can melt on palm
Gallium
Caesium

Question 7

Name the metals and it’s type which are so soft that they can be cut with a knife.

Answer 7

Alkali Metals like Sodium Lithium and Potassium
*They have low densities and low melting points

Question 8

Which oxides are produced by Non metals and Metals?

Answer 8

Non metals produce Acidic Oxides when dissolved in water
Metals produce Basic Oxides

Question 9

What are Amphoteric Oxides ?
Give eg

Answer 9

Oxides which react with both acids as well as bases to produce salt and water are called Amphoteric Oxides
Eg
Zinc Oxide
Aluminium Oxide

Question 10

What happens when Potassium and Sodium are kept in Open?

Answer 10

They catch fire
Hence kept in kerosene

Question 11

What’s Anodising ?

Answer 11

Process of forming a thick oxide layer of aluminium

Question 12

Metal + water gives???

Answer 12

Metal Oxide+Hydrogen

Question 13

Metal Oxide + water gives????

Answer 13

Metal Hydroxide

Question 14

When does Metals like Potassium and Sodium react violently??

Answer 14

They react violently with Cold water
This reaction is exothermic and evolved hydrogen immediately catches fire.

Question 15

What happens when calcium reacts with water???
Why does Calcium floats ??

Answer 15

It’s less violent. Heat evolved is not sufficient for hydrogen to catch fire

Calcium starts floating bcz bubbles of hydrogen gas formed stick to the surface of metal.

Question 16

Does Magnesium reacts with cold water or hot water??

Answer 16

It reacts with hot water and forms Magnesium hydroxide and hydrogen and it also floats like calcium due to same reason.

Question 17

Name the metals which reacts with steam and not with hot or cold water.

Answer 17

Aluminium, Iron , Zinc

Question 18

Name the metals which do not react with water at all.

Answer 18

Lead
Copper
Silver
Gold

Question 19

Which Non metal is liquid when all are either gases or solids?

Answer 19

Bromine

Question 20

Which Non metal is lustrous ?

Answer 20

Iodine

Question 21

Name the non metal which Is conductor of electricity and a non metal which is hardest and has very high melting point?

Answer 21

Con of elect - Graphite
Hardest and high melting point - Diamond

Both are allotrope of Carbons