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JEE CHEMISTRY MCQ: SOME BASIC CONCEPTS OF CHEMISTRY

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50 litres of water containing Ca(HCO3)2\mathrm{Ca}\left(\mathrm{HCO}_3\right)_2 when converted into soft water required 22.2 g Ca(OH)222.2 \mathrm{~g} \mathrm{~Ca}(\mathrm{OH})_2. Calculate the amount of Ca(HCO3)2\mathrm{Ca}\left(\mathrm{HCO}_3\right)_2 present per litre of hard water.
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Correct option: A
0.972 g L−10.972 \mathrm{~g} \mathrm{~L}^{-1}
Option A (0.972 g L−10.972 \mathrm{~g} \mathrm{~L}^{-1}) is correct because it is the calculated amount of Ca(HCO3)2\mathrm{Ca(HCO_3)_2} per liter based on the reaction with Ca(OH)2\mathrm{Ca(OH)_2}.

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