Which of the following is not true

Physical Constants : D₂O > H₂O

Reason, Due to high molecular weight of D₂O[20] than  that of H₂O.

Molecular mass $\infty$Physical constants

Exception Dielectric constant (D)

[Dielectric const] D : H₂O > D₂O

→ Ordinary water is electrolysed more rapidly than D₂O

Reason ; Dielectric constant of water [D_H2O] > Dielectric constant of D₂O[D_D2O]

Note : Dielectric constant is the ability of a solvent to ionise the bond of a salt.

Higher the dielectric constant higher will be the ionisation ability.

→ Bond Dissociation energy :

As bond dissaciation energy ↓es reactivity with Cl₂ ↑es.