Question

II. Fill in the blanks.

1. Most of the metals have____.
melting points.
2. Magnesium liberates______.
gas on reacting with boiling water.
3. The method of changing the properties of the metal is called
____.

4.'_____reacts with oxygen to form its oxide only when it is strongly heated.
5. The process of depositing a layer of zinc on iron articles is called______.​

Answer 1

Answer:

$your \: anwer$

1. Most of the metals have almost

melting points.

2. Magnesium liberates h2

gas on reacting with boiling water.

3. The method of changing the properties of the metal is called annealing

4.'Hydrozen reacts with oxygen to form its oxide only when it is strongly heated.

5. The process of depositing a layer of zinc on iron articles is called galvanization.

Explanation:

When magnesium is burnt, it reacts with the heat and gives bright flames and this change cannot be reversed.

When iron heated strongly it turns red. When heating is stopped it cools and get backs to its original form. So this is a physical change.