Explanation: A pure substance is one which is made up of only one kind of atoms or molecules. They have the same composition throughout. 2.Rusting of an article made up of iron is called (a) corrosion ...
1.What do you understand by valence electrons. 2.Name the anion and cation that constitute the molecule of calcium oxide. 3.An element 'X' has atomic number 13. Write the formula of its oxide. 4.Write ...
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