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Q.

Which of the following is not a permanent change?

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a

Rusting of iron

b

Sublimation of naphthalene balls

c

All the above

d

Digestion of food  

answer is C.

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Detailed Solution

Sublimation is a physical change that is reversible. The sublimed naphthalene can be brought back to its original state therefore is not a permanent change.  Digestion and rusting are chemical changes.

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