Hardness of water is mainly due to the presence of

  • A calcium hydroxide or magnesium hydroxide
  • B calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
  • C sodium hydroxide or magnesium hydroxide
  • D calcium chloride or sodium chloride salts
jamb 2011chemistry

The correct answer is B. calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)

Salts of Calcium and Magnesium are responsible for hardness of water. Bicarbonates, Carbonates, Chlorides and Sulfates of Calcium and Magnesium causes temporary and permanent hardness.

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