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NCERT Solutions for Class 10th Science

 

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Chapter 2. Acids, Bases and Salts

Chapter Review

 

 

 

Chapter Review:


  • There are some substances whose odour changes in acidic or basic media. These are called olfactory indicators.
  • Vanilla, onion and clove, can be used as olfactory indicators.
  • The metal combines with the remaining part of the acid and forms a compound called a salt.
  • Limestone, chalk and marble are different forms of calcium carbonate.
  • The reaction between an acid and a base to give a salt and water is
    known as a neutralisation reaction.
  • Metallic oxides react with acids to give salts and water, similar to the
    reaction of a base with an acid, metallic oxides are said to be basic oxides.
  • All acids produce hydrogen ions, H+(aq), in solution.
  • All bases produce OH–(aq), in solution.
  • The pH of a neutral solution is 7.
  • Values less than 7 on the pH scale represent an acidic solution.
  • PH of rain water is less than 5.6, it is called acid rain.
  • Tooth decay starts when the pH of the mouth is lower than 5.5.
  • Salts of a strong acid and a strong base are neutral with pH value of 7.
  • The salt formed by the combination of hydrochloric acid and
    sodium hydroxide solution is called sodium chloride.
  • Deposits of solid salt are also found in several parts of the world. These large crystals are often brown due to impurities. This is
    called rock salt
  • When electricity is passed through an aqueous solution of sodium
    chloride (called brine).
  • The baking soda commonly used in the kitchen for making tasty crispy pakoras.
  • On heating gypsum at 373 K, it loses water molecules and becomes
    calcium sulphate hemihydrate. This is called Plaster of Paris.

 

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