Answer
As the electronegativity difference between the bonded atoms increases, the dipole moment of the molecule also increases.
Order of increasing electronegativity:
Te < Se < S < O
Order of increasing electronegativity difference:
$H_{2}Te < H_{2}Se < H_{2}S < H_{2}O$
Hence, the order of increasing dipole moment is:
$H_{2}Te < H_{2}Se < H_{2}S < H_{2}O$
Work Step by Step
As the electronegativity difference between the bonded atoms increases, the dipole moment of the molecule also increases.
Order of increasing electronegativity:
Te < Se < S < O
Order of increasing electronegativity difference:
$H_{2}Te < H_{2}Se < H_{2}S < H_{2}O$
Hence, the order of increasing dipole moment is:
$H_{2}Te < H_{2}Se < H_{2}S < H_{2}O$
