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Question

Of the two solvent H2O and D2O, NaCl dissolves:

A
equally in both solvents
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B
only in H2O but remains insoluble in D2O
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C
more in D2O
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D
more in H2O
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Solution

The correct option is D more in H2O
NaCl (and other ionic compounds) dissolve more in H2O than in D2O as the dielectric constant of H2O (78.39) is higher than the dielectric constant of D2O(78.06). This is due to lower molar mass of H2O as compared to that of D2O.

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