question_answer 82)

  Dihydrogen reacts with dioxygen\[({{O}_{2}})\] to form water. Write the name and formula of the product when the isotope of hydrogen which has one proton and one neutron in its nucleus is treated with oxygen. Will the reactivity of both the isotopes be the same towards oxygen? Justify your answer.

Answer:

  \[2{{D}_{2}}+{{O}_{2}}\to \underset{\begin{smallmatrix}  Heavy\,water \\  or  \\  Deuterium\,oxide \end{smallmatrix}}{\mathop{2{{D}_{2}}O}}\,\] Reactivity of deuterium will be less than hydrogen as the bond dissociation energy of dideuterium is more than dihydrogen.