Ncert Exercises & Solutions

Dihydrogen reacts with oxygen (O₂) 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.

The isotope of hydrogen which containts one proton and one neutron is deuterium (D). Therefore, when dideuterium reacts with dioxygen, heavy water (D₂O) is produced.

\underset{Dideuterium}{2 D_{2} (g)} + \underset{Dioxygen}{O_{2} (g)} \overset{Heat}{\to} \underset{Deuterium oxide}{2 D_{2} O}

(Heavy water)

The reactivity of H₂ and D₂ towards oxygen will be different. Since, the D-D bond is stronger than H-H bond, therefore, H₂ is more reactive than D₂.

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