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Subject :NSO    Class : Class 6

A few changes are given as:
I. Deflating of a cycle tyre tube
II. Chopping of potato
III. Melting of wax
IV. The burning of wood
Which of the following statements is incorrect regarding these changes?

AI and IV are reversible physical changes.
BII and IV are irreversible chemical changes.
CII and III are irreversible physical changes.
DAll of these

All of these are right ,so answer is D

Ans 1:

Class : Class 7
Yeah,the answer is D

Ans 2:

Class : Class 6
IV is burning of wood which is an irreversible change. How can it be D??

Ans 3:

Class : Class 6
Option A states that I and IV are reversible changes????!!?!?!?!?

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