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Write the Significance/Applications of Dipole Moment. - CBSE (Science) Class 11 - Chemistry

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Write the significance/applications of dipole moment.

Solution 1

In heteronuclear molecules, polarization arises due to a difference in the electronegativities of the constituents of atoms. As a result, one end of the molecule acquires a positive charge while the other end becomes negative. Hence, a molecule is said to possess a dipole.

The product of the magnitude of the charge and the distance between the centres of positive-negative charges is called the dipole moment (μ) of the molecule. It is a vector quantity and is represented by an arrow with its tail at the positive centre and head pointing towards a negative centre.

Dipole moment (μ) = charge (Q) × distance of separation (r)

The SI unit of a dipole moment is ‘esu’.

1 esu = 3.335 × 10–30 Cm

Dipole moment is the measure of the polarity of a bond. It is used to differentiate between polar and non-polar bonds since all non-polar molecules (e.g. H2, O2) have zero dipole moments. It is also helpful in calculating the percentage ionic character of a molecule.

Solution 2

In predicting the nature of the molecules: Molecules with specific dipole moments are polar in nature and those of zero dipole moments are non-polar in nature.

In the determination of shapes of molecules.

In calculating the percentage ionic character.

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 NCERT Solution for Chemistry Textbook for Class 11 (2018 to Current)
Chapter 4: Chemical Bonding and Molecular Structure
Q: 16 | Page no. 130

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Solution Write the Significance/Applications of Dipole Moment. Concept: Bond Parameters - Polarity of Bonds.
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