Rusting of an object made of iron is called rusting. Rust is a chemical change because rust is a chemical compound (hydrated iron oxide), completely different from the element iron (Fe).
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A mixture of sulphur and carbon disulphide is a heterogeneous colloid and shows the Tyndall effect. The particles in a colloidal solution are so large that they can scatter light. This phenomenon of scattering of light by colloidal particles is ...
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