Water is said to be temporarily hard when it contains

  • A Ca (HCO3)2 and Mg (HCO3)2 salts
  • B Ca (HCO3)2 and CaCO3 SALTS
  • C Mg(HCO3)2 and CaSO4 salts
  • D CaSO4 and Ca(HCO3)2 salts
jamb 2014chemistry

The correct answer is B. Ca (HCO3)2 and CaCO3 SALTS

Temporary hardness is caused by the presence of dissolved calcium hydrogentrioxocarbonate(IV) which decomposes on heating to form calcium trioxocarbonate(IV).

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