Explain about the exchange reactions of deuterium oxide.

Explanation

When compounds containing hydrogen are treated with `D_2`O, hydrogen undergoes an exchange for Deuterium.
`underset("Sodium hydroxide")(2NaOH) + underset("Heavy water")(D_2 O) to underset("Sodium deutroxide")(2NaOD) + HOD`
`underset("Hydrogen chloride")(HCl) + D_2 O to underset(Deuterium chloride")(DCl) + HOD`
`underset("Ammonium chloride")(NH_4Cl) + 4D_2 to underset("Deutero Ammonium Chloride")(ND_4 CL + 4HOD)`