Question

WHich of the following substance has dipole moment more than zero?

• A. Water
• B. Methane
• C. Carbon dioxide
• D. Nitrogen

Answer 1

The correct option is A Water

Dipole moment: It is the measurement of bond polarity.

Denoted by $[\mu =e.d]$

$e=4.8\times {10}^{-10}e.s.u$

$d=$distance in centimeter

Unit of $\mu =$ debye (D)

(i)Lone pair moment due to lone pair

(ii)Bond pair moment due to bond direction from low electronegative to high E.N

So,considering molecules $H_{2}O,C{H}_4,C{O}_2,N_2$

Refer to image,

(iv)$N_2$ $N\equiv N$ $[\mu =0]$

Answer is water has dipole moment more than zero.