Question

___________is an irreversible change.  a. Burning of coal   c.Melting of wax  b. Melting of ice   d.Formation of ice​

Answer 1

Answer:

burning of coal

is the right answer....

Answer 2

Answer:

Burning  of  coal    is  an  irreversible  change.  

✳ These irreversible  changes are also called chemical changes.

CHEMICAL and PHYSICAL CHANGES

PHYSICAL CHANGES

• These  are reversible changes.
• No new products are formed.
• Less energy or no energy is absorbed during the reaction.
• No energy is released during the reaction.
• Examples → Melting  of  wax , Melting of ice , Boiling of water, etc.

CHEMICAL CHANGES

• These are irreversible  changes.  
• New product is formed.
• Energy is absorbed during the reaction.
• Energy is also released during the reaction.
• Examples → Ripening of fruits, Curdling of milk , Rusting of Iron , Digestion of food , etc.