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Calcuim and magnesium ion form a `10^5` litre of sample of hard water was quantitatively precipitated as carbonates and weight of ppt obtained was found to be 568 g. Precipitate lost 264 g of weight on strong heating.A. Degree of hardness of water is 4 ppmB. Molarity of `Ca^(2+)` ions in hard water was `4xx10^(-5)M`C. Molarity of `Mg^(2+)` ions in hard water `4xx10^(-5) M`D. Sum of molarity of `Ca^(2+)` & `Mg^(2+)` ions in hard water was `6xx10^(-5) M` |
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Answer» Correct Answer - B,D `underset(ag)(CaCO_3)+underset((568a-g))(MgCO_3)` `44/100xxa+44/84xx(568-a)=264` or a=400 g |
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