As solution cools, potassium chloride gets crystallized or precipitated. Because at 353K, solubility of potassium chloride is 54 g per 100 g of water. Whereas at room. temperature (20°C) it is 35 g. So excess of potassium chloride dissolved gets precipitated.
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warning Report Error Page 8Answer: Elements : The elements are regarded as the building blocks of the universe. So (a) sodium, (d) silver, (f) tin and (g) silicon are elements. Compounds : It is a pure substance made up of two or more elements chemically combined in a fixed proportion by mass. So, (e) calcium carbonate, (k) methane and (l) carbon dioxide are compounds. Mixtures : It is a substance containing two or more substance (elements or compound) in any proportion. So (b) soil, (c) sugar solution, (h) coal, (i) air, (j) soap and (m) blood are mixtures. Page 9
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warning Report Error Page 11Answer: (c) Rusting of an article made up of iron is called corrosion. Corrosion is a chemical change because rust is a chemical compound (hydrated iron oxide, Page 12
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