How is heavy water prepared? Compare its physical properties with those of ordinary water.

<p><span data-teams="true">This is a short answer type question as classified in NCERT Exemplar</span></p><p>Heavy water can be made by electrolyzing water repeatedly or as a by-product in the fertiliser industry. It's a deuterium compound that's used to make other deuterium compounds.</p><p>Physical Properties of H₂O and D₂O</p><table><tbody><tr><td><p><strong>Property</strong></p></td><td><p><strong>H₂O</strong></p></td><td><p><strong>D₂O</strong></p></td></tr><tr><td><p>Molecular mass (g mol-1)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p></td><td><p>18.015</p></td><td><p>20.0276</p></td></tr><tr><td><p>Melting point/K&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p></td><td><p>273.0&nbsp;&nbsp;</p></td><td><p>276.8</p></td></tr><tr><td><p>Boiling point/K&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p></td><td><p>373.0&nbsp;&nbsp;</p></td><td><p>374.4</p></td></tr><tr><td><p>Enthalpy of formation/kJ mol-</p></td><td><p>-285.9&nbsp;</p></td><td><p>-294.6</p></td></tr><tr><td><p>Enthalpy of Vaporisation (373 K)/kJ mol^-1</p></td><td><p>40.66&nbsp;&nbsp;</p></td><td><p>41.61</p></td></tr><tr><td><p>Enthalpy of fusion/kJ mol-1</p></td><td><p>6.01&nbsp;&nbsp;&nbsp;&nbsp;</p></td><td><p>—</p></td></tr><tr><td><p>Temp of max. density/K&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p></td><td><p>276.98</p></td><td><p>284.2</p></td></tr><tr><td><p>Density (298 K)/g cm-3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</p></td><td><p>1.0000</p></td><td><p>1.1059</p></td></tr><tr><td><p>Viscosity/centipoise&nbsp;&nbsp;</p></td><td><p>0.8903</p></td><td><p>1.107</p></td></tr><tr><td><p>Dielectric constant/C2/N.m2&nbsp;</p></td><td><p>78.39&nbsp;&nbsp;</p></td><td><p>78.06</p></td></tr></tbody></table>

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