Which of the following is not true

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Ordinary water is electrolysed more rapidly than D2O

Reaction between H2 and Cl2 is much faster than D2 and Cl2

D2O freezes at lower temperature than H2O

Bond dissociation energy for D2 is greater than H2

answer is C.

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Detailed Solution

Physical Constants : D2O > H2OReason, Due to high molecular weight of D2O[20] than that of H2O.Molecular mass ∞Physical constantsException Dielectric constant (D)[Dielectric const] D : H2O > D2O→ Ordinary water is electrolysed more rapidly than D2OReason ; Dielectric constant of water [DH2O] > Dielectric constant of D2O[DD2O]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.

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