Answer - The chemical reactions in which oxidation and reduction takes place simultaneously are called redox reactions. ‘Red’ stands for reduction and ‘ox’ stands for oxidation
Answer - 1. When edible oils are left exposed to air for long period of time, they become rancid (i.e. the oils get oxidized.) 2. Rancid oils have a foul odour and unpleasant taste. 3. Thus, rancid oil is of no use. 4. Edible oils is not allowed to stand exposed to air for long to avoid rancidity.
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 - 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.
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