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a
changes abruptly from solid to liquid when heated
b
has no definite melting point
c
undergoes deformation of its geometry easily
d
has an irregular 3-dimensional arrangements
answer is A.
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Detailed Solution
In crystalline solid there is perfect arrangement of the constituent particles only at 0K. As the temperature increases the chance that a lattice site may be unoccupied by an ion increases. As the number of defects increases with temperature solid changes to liquid.