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The chalk that is used to write on black boards is mostly salt. It is a salt of which of the following metals?

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The chalk that is used to write on black boards is mostly salt. It is a salt of which of the following metals?
1. Aluminium
2. Copper
3. Magnesium
4. Calcium
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Correct Answer - Option 4 : Calcium

The correct answer is Calcium.

  • The chalk contains a salt of calcium i.e. calcium carbonate.
  • Formula- CaCO3 

  • Important salts
  • Gypsum- CaSO4·2H2O (calcium sulfate dihydrate)
  • Blue Vitriol- CuSO4·5H2O  (copper(II) sulfate)
  • Green Vitriol- FeSO4·7H2O (iron(II) sulfate)
  • Red vitriol- CoSO4·7H2O (cobalt(II) sulfate)
  • White vitriol- ZnSO4·7H2O (zinc sulfate)
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