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Answer 1

Answer:

1. Acids :

• Acids react with metal oxides to form salt and water .
• Acids have corrosive nature.
• Acids dissociates H+ ions in aqueous solution.

Bases :

• Bases react with non metals to form salt and water .
• Bases have non corrosive nature.
• Bases dissociates OH - ions in aqueous solution .

2) Sodium Hydroxide is produced by electrolysis of a a concentrated aqueous solution of sodium chloride( which is called brine) .

When electricity is passed through a concentrated solution of sodium chloride, it decomposes to form Sodium Hydroxide, chlorine and hydrogen.

sodium hydroxide solution is formed near cathode.

3) Chemical formula of bleaching powder is CaOCl2 .

Chemical formula of baking soda is NaHCO3.

Chemical formula of washing soda is Na2CO3.

chemical formula of gypsum is CaSO4. 2H2O.

4) when we eat food containing sugar then the bacteria present in our mouth break down the sugar to form acids. Thus acid is formed in mouth after sugary food has been eaten. this acid lowers the PH in the mouth. Tooth decay starts when the pH of acid formed in the mouth falls below 5.5. this is because then the acid becomes strong enough to attack the enamel of teeth and corroded .This sets in tooth decay.

many toothpastes contain bases to neutralize the mouth acid so using the toothpaste for cleaning the teeth can neutralize the excess acid in mouth and prevent tooth decay.