Classify the crystals on the basis of nature of bonds existing between the constituent particles forming the crystal.

Briefly explain the packing of the constituent particles in a crystal.

The crystal very soft in nature is

What are molecular crystals ? Name the forces which are holding the constituent particles in molecular crystals.

Which of the following are not correctly matched with the bonds found between the constituents particle?

What type of force does exist between two atoms in an ionic bond?

A pure covalent bond is formed between :

which of the following is not a characteristic of a crystalline solid ? (a) Definite and characteristic heat of fusion. (b) Isotropic nature (c) A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal. (d) A true solid.

Which type of bond exists between the two boron atoms in a diborane molecule ?

How are the colloidal classified on the basis of the nature of interaction between dispersed phase and dispersion medium? Describe an important characteristic of each class. Which of these sols need stabilising agents for preservaion?

In the crystals of which of the following ionic compounds would you expect maximum distance between the centres of the cations and anion?