Question

Which of the following is NOT a chemical change?

A

Digestion of food

B

Precipitation of rain and snow

C

Rusting of iron

D

Burning of paper

Medium

Solution

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Correct option is
B

Precipitation of rain and snow

Precipitation is any product of the condensation of atmospheric water vapour that falls under gravity. The main forms of precipitation include drizzle, rain, sleet, and snow

Precipitation occurs when a portion of the atmosphere becomes saturated with water vapour so that the water condenses and "precipitates". Here the water vapour in the air is changing from one form to another i.e., from rain to snow. No new product is formed. 

So precipitation of snow and rain is not a chemical change. In the other options, a new substance is formed and the main substances cannot be reversed. So, they are chemical changes.

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