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Q.

Is it true that rusting of iron and changing of milk into curd are irreversible changes?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
The change which cannot be reversed, that is, we cannot get back its original form, is called reversible changes. The action of air and moisture on the surface of iron forms a dull substance that covers the surface of the iron. This process is called rusting. Once covered with rust, iron cannot return to its original form. The curd is made from milk. Curd, once made from milk, cannot be converted back to milk again. So, rusting of iron and changing of milk into curd are irreversible changes.
 
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