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Water is said to be temporarily hard when it contains

Chemistry
JAMB 2014

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
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Correct Answer: Option A
Explanation

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

There is an explanation video available below.

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Explanation Video

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free