ChemistryWaterJAMB
Temporary hardness of water is caused by dissolved:
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Answer: B. calcium hydrogentrioxocarbonate(IV)
Ca(HCO₃)₂ decomposes on boiling, removing the hardness; sulphates and chlorides cause permanent hardness.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.