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Question

Versene, a chelating agent has chemical formula C2H4N2(C2H2O2Na)4. If each mole of this compound could bind 1 mole of Ca2+, then the rating of pure versene expressed as mg of CaCO3 bound per g of chelating agent is:

A
100 mg
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B
163 mg
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C
200 mg
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D
263 mg
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