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Answer 1

Answer:

11) i)in plants and animals, ph helps to identify the nature of the enzymes

   ii)An increase in the acidic nature of the food causes calcium         phosphate(tooth) to decay

   iii)Identify the nature of the enzymes

   iv)Identify the nature of the soil according to the crops.

12) Strong Acids: HCL, HNO3, H2SO4

     Strong Bases: NaOH, KOH

13) i) ph will be neutral  

    ii) ph will be acidic

    iii) ph will be basic

14) It is used for the preparation of caustic soda(NaOH)

15) i) For bleaching purposes, used in purification of water

     ii)Used in fire extinguishers, for baking purposes, used as a mild antiseptic

     iii) For washing purpose, for softening hard water

     iv)For the preparation of plaster of paris, Used as a chalk

16) When CO2 is passed to limewater, it turns milky due to the formation of calcium carbonate

   The milky appearance disappears when excess CO2 is passed due to the formation of calcium bicarbonate

17) Question is incomplete

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