Class X

The nature of calcium phosphate is present in tooth enamel is
  1. Basic
  2. Amphoteric
  3. Acidic
  4. Neutral
Which of the following substance is antacid?
  1. NaCl
  2. Mg(OH)2
  3. HCl
  4. H2SO4
Which of the following does not form an acidic salt?
  1. Phosphoric acid
  2. Carbonic acid
  3. Hydrochloric acid
  4. Sulphuric acid
Bases leaves blue litmus
  1. red
  2. pint
  3. black
  4. unchanged
Lime water is
  1. CaO
  2. Ca(OH)2
  3. CaCO3
  4. CaCI2
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