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Answer :
(A) Changes that can be reversed:
(I) Writing with a pencil.
(II) Switching on or off of the fan.
(III) Making ice from water.
(IV) Inflating a balloon
(B) Changes then can not be reversed:
(I) Writing with a pen.
(II) Making curd from milk.
(III) Burning of paper.
(IV) Ripening of fruit