(a) A milkman adds a very small amount of baking soda to fresh milk. Why does this milk take a longer time to set as curd?
(b) Mention the nature of toothpastes. How do they prevent tooth decay?
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Explanation:
(a) It takes longer time to set as curd as bacteria do not work well in presence of sodium hydrogencarbonate, i.e. fermentation will take place slowly.
(b) Toothpastes are basic in nature. They neutralize the acid formed in mouth which causes tooth decay.
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a) since baking soda reacts after a lot of time it was put
b) they have certain substances that take out the yellowish part on our teeth
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