First slide

Water and Heavy water

Question

The value of ........ is less for D₂O compared to that of H₂O.

Easy

A

density (g.ml^–1)at 20⁰C
B

boiling point
C

dielectric constant at 20⁰C
D

latent heat of vapourisation (j.g^–1)

Solution

All physical constants OF: D2O > H2O
Reason: Physical properties $α$ Molecular mass
Exception: Dielectric costant: H2O > D2O
Dielectric constant is a measure of ionisation of a Salt by the solvent example:
$\large NaCl\xrightarrow{{{H_2}O}}\;N{a^ + } + C{l^ \circleddash }$

→Density: $D_{2} O > H_{2} O$
→Boiling point D2O > H2O
→ Latent heat of vapoursation : D2O > H2O
→ Dielectric constant : $H_{2} O > D_{2} O$

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