Why polar molecular solids are soft solids even though they have strong dipole dipole interaction?

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Solution

1. The polar molecular solids such as sugar etc, are formed by the attraction in dipoles.

2. These dipoles are not the permanent charges but the induced charges, that are induced by the polar environment of the molecule.

3. The as these are weaker forces, the solids formed are comapratively soft as compared to ionic or covalent solids.

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Similar questions

Match the following:

(1)Non-polar Molecular solids (i) Coulombic or electrostatic forces

(2)H-Bonded Molecular solids (ii) H-bonding

(3)Ionic solids (iii) Metallic bonding

(4)Covalent solids (iv) Weak dispersion forces

(5)Metallic solids (v) dipole – dipole interaction

(vi) covalent Bonding

Q. Dipole-dipole interaction energy between polar molecules in solids depends on the radius of the molecule

(r)

and it is directly proportional to:

Match the following:

$\begin{matrix} C o l u m n I & C o l u m n I I (1) . N o n - p o l a r M o l e c u l a r s o l i d s & (i) C o u l o m b i c o r e l e c t r o s t a t i c f o r c e s (2) . H - B o n d e d M o l e c u l a r s o l i d s & (i i) . H - b o n d i n g (3) . I o n i c s o l i d s & (i i i) . M e t a l l i c b o n d i n g (4) . W e a k d i s p e r s i o n f o r c e s & (i v) . W e a k d i s p e r s i o n f o r c e s (5) . M e t a l l i c s o l i d s & (v) . d i p o l e - d i p o l e i n t e r a c t i o n . (v i) . c o v a l e n t B o n d i n g . \end{matrix}$

Match the following:

Q. Which selection is a polar molecular substance with a weak dipole-dipole interaction?

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