Chemical Properties Of Metal

Question 1

Reaction With Oxygen

Answer 1

Metal reacts with oxygen to form oxides which are alkaline in nature

Question 2

Amphoteric oxides

Answer 2

Some metals behave like both acids and base, reacting with both acids and bases to form salts and water.

aluminum oxide (Al₂O₃) and zinc oxide (ZnO).

Question 3

Why some metals are amphoteric in nature?

Answer 3

Multiple oxidation states

Question 4

Why sodium and potassium are kept in kerosene oil

Answer 4

They are highly reactive so when they come and contact with air they react with oxygen and catch fire

Question 5

Which metal show no reactivity with oxygen

Answer 5

Gold and silver

Question 6

Lithium is kept in

Answer 6

Paraffin wax because lithium floats on kerosene oil to avoid contact with atmosphere it is kept in paraffin wax

Question 7

Reaction With Water

Answer 7

They typically form metal oxides or hydroxides and release hydrogen gas.

Metal + Water → Metal Oxide + H2

Metal Oxide + Water → Metal Hydroxide + H2

Question 8

Which metal reacts vigorously with water

Answer 8

Sodium and potassium reacts with restly with water

•H2 catches fire

Question 9

Reaction with acid

Answer 9

Metals more reactive than hydrogen evolve hydrogen on reaction with acid

2Mg +2 H2O → 2Mgcl + H2

But,
CU + HCL→ no reaction

Question 10

Reaction with base

Answer 10

Evolve H2 with popup sound when a burning matchstick is brought near

Question 11

Why the popup sound occurs

Answer 11

We know that heat causes gases to expand , so whenever we bring hydrogen in contact with heat it expands , it is so fast that it breaks the sound barrier and as a result we hear a ‘pop’ sound.