It was Paheli’s birthday, her brother Simba was helping her to decorate the house for the birthday party and their parents were also busy making other arrangements. Following were the activities going on at Paheli’s home. Identify the activities at Paheli’s home as those that are reversible and irreversible.

(i) Simba blew balloons and put them on the wall [[1]]. 

(ii) Some of the balloons burst[[2]]. 

(iii) Paheli cut colour full strips of paper and put them on the wall with the help of tape[[3]].

 (iv) She also made some flowers with origami (paper folding) to decorate the house[[1]]. 

(v) Her father made dough balls[[4]]. 

(vi) Mother rolled the dough balls to make puris.[[5]]

(vii) Mother heated oil in a pan[[6]].

 (viii) Father fried the puris in hot oil. [[7]].

We must be aware of both reactions in order to determine which one is inherently reversible and which is irreversible. Reversible reactions occur when a substance has a reversible nature, meaning that it can be changed back to its original state after the reaction is finished. Irreversible reactions, on the other hand, occur when a substance does not have a reversible nature, meaning that it cannot be changed back to its original state.
All chemical changes are irreversible in nature, although most physical changes are reversible. Chemical properties of the system remain the same while modifications are reversible, but they alter when changes are irreversible.

Reversible change are those that can be brought back to their initial stage. The reversible changes are-
(i) Simba blows up a balloon and hangs it on the wall.
(iv) She made  flowers with origami (paper folding). She decorates the house. 
(v) Her father made a ball of her dough. 
(vi) Her mother rolled  her dough to make a puree. 
(vii) Her mother heats the oil in the pot. 
Ireeversible change are those that cannot be brought back to their initial stage. The reversible changes are-
(ii) Some balloons burst. 
(iii) Paheli cuts a strip of colored paper and tapes it to the wall. 
(viii) My father fried Puri in hot oil.