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Question

Which one of the following is not a chemical change?

(a) Formation of curd (b) Ripening of banana

(c) Sublimation of naphthalene (d) Corrosion of photo frame

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Solution

(c) sublimation of naphthalene

It's a physical change because there is no chemical reaction involved. Naphthalene's temperature rises and it eventually sublimates, but, it's chemical composition remains the same.


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