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Class 10 Exam  >  Class 10 Questions  >  Calcium phosphate is present in tooth enamel.... Start Learning for Free
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Calcium phosphate is present in tooth enamel. Its nature is
  • a)
    basic 
  • b)
    acidic
  • c)
    neutral
  • d)
    amphoteric
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Calcium phosphate is present in tooth enamel. Its nature isa)basicb)ac...
Calcium phosphate Ca3(PO4)2  is a salt of strong base Ca(OH)2 and weak acid, phosphoric acid.
Therefore, it is basic.
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Calcium phosphate is present in tooth enamel. Its nature isa)basicb)ac...
If it is acidic then bacteria start secreting there secretions which result in cavity hence it is basic
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Calcium phosphate is present in tooth enamel. Its nature isa)basicb)ac...
Question_answer Calcium phosphate is present in tooth enamel. Its nature is Answer: (a) Calcium phosphate is basic salt, as it is a salt of weak acid (phosphoric acid) and slightly stronger base (calcium hydroxide) (though both are wea
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Read the given passage and answer the question :A sample of water which gives lather with soap with difficulty is known as hard water, while a sample of water which gives lather with soap easily is known as soft water. Hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium. Hardness of water is of two types, temporary and permanent hardness. When hardness of water is due to the presence of bicarbonates of magnesium and calcium, it is called temporary hardness. When hardness of water is due to the presence of sulphates and chlorides of magnesium and calcium, it is called permanent hardness.The amount of hardness causing substances in a certain volume of water measures the extent of hardness or degree of hardness. Hardness of water is always calculated in terms of calcium carbonate although it is never responsible for causing hardness of water because of its insoluble nature. The reason for choosing calcium carbonate as the standard for calculating hardness of water is the ease in calculation as its molecular weight is exactly 100. Degree of hardness is usually expressed as parts per million (ppm).Q. Why do soaps not form lather (foam) with hard water?

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Calcium phosphate is present in tooth enamel. Its nature isa)basicb)acidicc)neutrald)amphotericCorrect answer is option 'A'. Can you explain this answer?
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