Hardness of a water sample is 100 ppm CaCO3. Thus, molarity of CaCO3 is

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2×10-3M

1×10-3M

2×10-2M

2×10-4M

answer is B.

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Detailed Solution

Hard water has hardness = 100 ppmThus,106ml103L water has =100 g of CaCO3=1 mole of CaCO3Thus, molarity =MolesLitre=1103=1×10-3M

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