First slide

Water and Heavy water

Question

The physical constant which is less for water than for heavy water is
A) Dielectric constant B) Ionic product

Easy

A

A, but not B
B

B, but not A
C

Both A and B
D

Neither A nor B

Solution

$\mathop {{D_2}O}\limits_{20} > \mathop {{H_2}O}\limits_{18} \$
All physical constants : D₂O > H₂O
Except Dielectric constant [D] D₂O < H₂O
$\boxed{\mathop {Physical\;Cons\tan ts}\limits_{[Physical\;properties]} \propto \mathop {Molecular\;mass}\limits_{[M.Wt]} }\$
Ionic Product : H₂O > O₂O
$\large H_2O\rightleftharpoons H^++OH^-=1 \times 10^{-14}=IP$
$\large D_2O\rightleftharpoons D^++OD^-=8 \times 10^{-15}=IP$

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