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  What is the nature of the salt if the pH of its solution is greater than 7? Name the acid and base would be used to prepare the following salts              (a) Potassium sulphate (b) Ammonium chloride

Answer:

                  When the pH in the mouth falls below 5.5, tooth decay starts. Bacteria present in the mouth produce acid by degradation of sugar and food particles which remain in the mouth after eating. The acid produced in the mouth attack the enamel thereby creating tooth decay.                                                                (3)