Answer:
(i) (a) In
hexagonal crystal system, the axial distances 
but in monoclinic
crystal system, the three axial distances are altogether different i.e. 
.
(b) In hexagonal
crystal system, axial angles are 
whereas in
monoclinic type, these are 
(c) Graphite, ZnO are
the examples of hexagonal crystal systems while monoclinic sulphur, 
are the examples
of monoclinic crystal system.
(ii) (a) In
addition to the atom at the corner, in face centred unit cell, an atom is
present at the centre of each of the six faces of the unit cell whereas in
end-centred unit cell two particles are located at the centre of any two
opposite faces.
(b) Number of atoms
per unit cell in face-centred unit cell is 4 but in end-centred unit cell it is
2.
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