How can D_2O be prepared from water ? Mention the physical properties in which D_2O differs from H_2O. Give at least three reactions of D_2O showing the exchange of hydrogen with deuterium.

How can D_2O be prepared from water ? Mention the physical properties

1.	How can D_2O be prepared from water ? Mention the physical properties in which D_2O differs from H_2O. Give at least three reactions of D_2O showing the exchange of hydrogen with deuterium.
Answer» Solution :`D_2O`is prepared by prolonged electrolysis of water. Physical properties : (i) `D_2O`is colourless, ODOURLESS and tasteless liquid. Its MAXIMUM density is `-1.1073 GML^(-1)`It `11.6^@C` maximum density of water is `4^@C`. (ii) The solubility of salt in heavy water is LESS than ordinary water. So, the viscosity is HIGH of heavy water. (iii) Exchange reactions of hydrogen with deuterium `NaOH+D_2OtoNaOD+ HOD` `HCl+ D_2O to DCl + HOD` `NH_4Cl + D_2O to NH_3DCl + HOD`