Which property is NOT true of a crystalline solid (it is not isotropic)

1. A.
   There is a regularity and periodicity in arrangement of constituent particles.
2. B.
   It is isotropic.
3. C.
   It melts at definite temperature.
4. D.
   It has different magnitudes for refractive index in every direction.

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1. A.
   These substances have sharp melting point.
2. B.
   These have different values of refractive index in different directions.
3. C.
   The constituent particles are orderly arranged.
4. D.
   These are isotropic.

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