Answer - The slow process of decay or distinction ions of a metal due to the effect of air, moisture, acids, alkalies, or other chemicals on it is called corrosion.
Answer - 1. The atomic numbers of the elements increase as we go down the group. Thus, the elements placed lower have more electrons. 2. To accommodate these electrons new shells are added to the atom. 3. These new shells take the outermost electrons farther from the nucleus causing atomic size (radius) to increase as we go down the group . 3.
Answer - 1. Usually grills of doors and windows are made of iron. 2. Iron objects get rusted on exposure to moist air. 3. Since air always contains moisture, iron grills get rusted. 4. Painting iron objects prevents rusting, hence iron grills of doors and windows are painted before they are used.
Answer - 1. To make a chemical equation more informative, the physical states of the reactants and products are mentioned along with their chemical formulae. 2. The gaseous, liquid, aqueous and solid states of reactants and products are represented by the notations (g), (l), (aq) and (s) respectively. 3. The word aqueous (aq) is written if the reactant or product is present as a solution in water
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