(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/
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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/