First slide

Water and Heavy water

Question

Which of the following is not true

Easy

A

Ordinary water is electrolysed more rapidly than D₂O
B

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

D₂O freezes at lower temperature than H₂O
D

Bond dissociation energy for D₂ is greater than H₂

Solution

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 :
$\large \xrightarrow{D_2 \;>\;H_2}$
As bond dissaciation energy ↓es reactivity with Cl₂ ↑es.

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App