Q.

A crystalline solid

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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.
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