Ordinary starch stirred with cold water will result in a suspension (c) because starch particles do not dissolve in cold water but remain dispersed as insoluble particles. This mixture is heterogeneous, and the starch eventually settles at the bottom over ...
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(c) Changes (i), (iii) and (iv) are physical in nature because we can get back to the original form by physical methods. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/
(c) The composition in wood and soil may not be the same throughout, only ice and air are homogeneous. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/
(c) The name given to rusting of iron is corrosion and it involves a chemical change. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/
(c). A mixture contains two elements or two compounds or an element and a compound. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/