MCQ
Which of the following is not correct for ${D_2}O$
- ABoiling point is higher than ${H_2}O$
- B${D_2}O$ reacts slowly than ${H_2}O$
- CViscosity is higher than ${H_2}O$ at ${25^o}$
- ✓Solubility of $NaCl$ in it is more than ${H_2}O$
✓
Answer
Correct option: D.
Solubility of $NaCl$ in it is more than ${H_2}O$
d
In order for an ionic compound to be soluble in a solvent it has to be first get in between the solvent molecules, for this in case of water molecules it has to break $O - H$ bonds.
In order for an ionic compound to be soluble in a solvent it has to be first get in between the solvent molecules, for this in case of water molecules it has to break $O - H$ bonds.
However in the case of Heavy water the $O - D$ bond is slightly stronger and hence cannot be broken as easily as the $O - H$ bond, hence the $Na$ and $Cl$ are less solvated making them less soluble in heavy water.
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