Metals And Non-metals

Question 1

Most malleable metals

Answer 1

Gold (Au) and silver (Ag)

Question 2

Most ductile metal

Answer 2

Gold (Au)

Question 3

Best conductors of heat

Answer 3

Silver (Ag) and copper (Cu)

Question 4

Poor conductors of heat

Answer 4

Lead (Pb) and Mercury (Hg)

Question 5

Metal liquid at room temperature

Answer 5

Mercury (Hg)

Question 6

Non-metal liquid at room temperature

Answer 6

Bromine (Br2)

Question 7

Metals with low melting points

Answer 7

Gallium (Ga) and Caesium (Cs)

Question 8

Lustrous non-metal

Answer 8

Iodine (I)

Question 9

Allotrope of Carbon which is the hardest substance with very high booking and melting point

Answer 9

Diamond

Question 10

Allotrope of Carbon which is a conductor of electricity

Answer 10

Graphite

Question 11

Soft alkali metals

Answer 11

Lithium (Li) Sodium (Na) and Potassium (K)

Question 12

Metal + Oxygen →

Answer 12

Metal oxide

Question 13

Amphoteric metals

Answer 13

Zinc Oxide (ZnO) and Aluminium Oxide (AlO)

Question 14

Metals dissolved in water

Answer 14

Alkalis

Question 15

In anodising aluminium article is kept

Answer 15

At anode in dilute sulphuric acid

Question 16

Metal + Water →

Answer 16

Metal oxide + Hydrogen
Or
Metal hydroxide (if metal is soluble in water)

Question 17

Metals that start floating in water

Answer 17

Calcium (Ca) and magnesium (Mg)

Question 18

Hydrogen gas is not evolved when metal reacts with

Answer 18

Nitric acid (HNO3)

Question 19

Metals that produce hydrogen when reacted with dil. HNO3

Answer 19

Magnesium (Mg) and Manganese (Mn)

Question 20

Ionic compounds are solid, hard and have high melting and boiling points because

Answer 20

Of the strong inter-ionic bond and force of attraction

Question 21

Ionic compounds are generally insoluble in

Answer 21

Kerosene, petrol, etc.