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we can justify that the rusting of iron is made up of moisture,air,water and dust particles.
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8.crystallisation is a process which separate pure solid in the form of its crystal. from a saturated solution. eg-sugar alum
9.because in rusting of iron a new substance is formed. so,rusting of iron Is a chemical change.
9.because in rusting of iron a new substance is formed. so,rusting of iron Is a chemical change.
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