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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(d) P is obtained by the combination of X and Y. Thus, it is a compound. X and Y cannot be broken into simpler substances. Thus, they are elements. As P is a compound, it has a fixed composition. https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/
(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/