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In nature,abundance of 1H1 and 2H1 are 99.985 and 0.015 percent respectively and water obtained from it contains H2O and D2O.The number of D2O molecules in 400mL water (if density is assumed to be 1.0g/mL) will be :

(a)1021(b)2×1021(c)3×1021(d)4×1021

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