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Why crystallisation is called a physical change? |
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Answer» In the process of crystallisation, no new substance is formed, only a bigger substance is obtained in its crystal form. For example, to obtain a big crystal, a small piece of alum is hanged in the solution of alum with the help of a thread. After sometime, we observe that piece of alum becomes bigger in size.This is due to the fact that small pieces of alum gets deposited on alum. In this chemical composition of alum is not changed. Therefore, it is a physical change. |
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