Question

Observe the following changes: i) Blackening of silver ware       ii) Magnetization of iron iii) Fading the colours of clothes     iv) Crystallization of salts
Choose the correct answer from the following​

Answer 1

Answer:

Physical changes only lead to changes in physical properties of the substance and are reversible chemical changes lead to change in composition or the structure and are irreversible in nature.

(a) Photosynthesis: irreversible, chemical changes.

6CO

2

+6H

2

O⟶C

6

H

12

O

6

+6O

2

(b) Dissolving of water : reversible, physical change.

(c) Bumping of coal − irreversible, chemical change.

(d) Melting of wax − reversible by cooling, physical change.

(e) Physical change as mallacbility (beating metal into then sheets) does not change composition.

(f) Digestion − chemical change.

Answer 2

Answer:

iv correct

Explanation: